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* [PATCH v3] MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec
@ 2016-11-23  7:03 Liming Gao
  2016-11-23 16:18 ` Mudusuru, Giri P
  0 siblings, 1 reply; 2+ messages in thread
From: Liming Gao @ 2016-11-23  7:03 UTC (permalink / raw)
  To: edk2-devel

https://bugzilla.tianocore.org/show_bug.cgi?id=201

In V3, Use Odt to replace ODT, Cke to replace CKE, Id to replace ID,
and Cl to replace CL in structure field name.

In V2, separate DDR3, DDR4 and LPDDR definition into the different files;
use the different SPD prefix as structure definitions for each SPD type.

Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 MdePkg/Include/IndustryStandard/SdramSpd.h      |  31 +-
 MdePkg/Include/IndustryStandard/SdramSpdDdr3.h  | 769 +++++++++++++++++++
 MdePkg/Include/IndustryStandard/SdramSpdDdr4.h  | 958 ++++++++++++++++++++++++
 MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h | 474 ++++++++++++
 4 files changed, 2221 insertions(+), 11 deletions(-)
 create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
 create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
 create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h

diff --git a/MdePkg/Include/IndustryStandard/SdramSpd.h b/MdePkg/Include/IndustryStandard/SdramSpd.h
index 2b2012b..68f9045 100644
--- a/MdePkg/Include/IndustryStandard/SdramSpd.h
+++ b/MdePkg/Include/IndustryStandard/SdramSpd.h
@@ -1,19 +1,23 @@
 /** @file
   This file contains definitions for the SPD fields on an SDRAM.
-    
-  Copyright (c) 2007 - 2008, Intel Corporation. All rights reserved.<BR>
-  This program and the accompanying materials                          
-  are licensed and made available under the terms and conditions of the BSD License         
-  which accompanies this distribution.  The full text of the license may be found at        
-  http://opensource.org/licenses/bsd-license.php                                            
 
-  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
-  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+  Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 **/
 
 #ifndef _SDRAM_SPD_H_
 #define _SDRAM_SPD_H_
 
+#include <IndustryStandard/SdramSpdDdr3.h>
+#include <IndustryStandard/SdramSpdDdr4.h>
+#include <IndustryStandard/SdramSpdLpDdr.h>
+
 //
 // SDRAM SPD field definitions
 //
@@ -47,9 +51,14 @@
 //
 // Memory Type Definitions
 //
-#define SPD_VAL_SDR_TYPE  4 ///< SDR SDRAM memory
-#define SPD_VAL_DDR_TYPE  7 ///< DDR SDRAM memory
-#define SPD_VAL_DDR2_TYPE 8 ///< DDR2 SDRAM memory
+#define SPD_VAL_SDR_TYPE  4       ///< SDR SDRAM memory
+#define SPD_VAL_DDR_TYPE  7       ///< DDR SDRAM memory
+#define SPD_VAL_DDR2_TYPE 8       ///< DDR2 SDRAM memory
+#define SPD_VAL_DDR3_TYPE 11      ///< DDR3 SDRAM memory
+#define SPD_VAL_DDR4_TYPE 12      ///< DDR4 SDRAM memory
+#define SPD_VAL_LPDDR3_TYPE 15    ///< LPDDR3 SDRAM memory
+#define SPD_VAL_LPDDR4_TYPE 16    ///< LPDDR4 SDRAM memory
+
 //
 // ECC Type Definitions
 //
diff --git a/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h b/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
new file mode 100644
index 0000000..e280919
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
@@ -0,0 +1,769 @@
+/** @file
+  This file contains definitions for SPD DDR3.
+
+  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  @par Revision Reference:
+    - Serial Presence Detect (SPD) for DDR3 SDRAM Modules Document Release 6
+      http://www.jedec.org/sites/default/files/docs/4_01_02_11R21A.pdf
+**/
+
+#ifndef _SDRAM_SPD_DDR3_H_
+#define _SDRAM_SPD_DDR3_H_
+
+#pragma pack (push, 1)
+
+typedef union {
+  struct {
+    UINT8  BytesUsed                           :  4; ///< Bits 3:0
+    UINT8  BytesTotal                          :  3; ///< Bits 6:4
+    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_DEVICE_DESCRIPTION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Minor                               :  4; ///< Bits 3:0
+    UINT8  Major                               :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_REVISION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Type                                :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_DRAM_DEVICE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ModuleType                          :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_MODULE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Density                             :  4; ///< Bits 3:0
+    UINT8  BankAddress                         :  3; ///< Bits 6:4
+    UINT8  Reserved                            :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_SDRAM_DENSITY_BANKS_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
+    UINT8  RowAddress                          :  3; ///< Bits 5:3
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_SDRAM_ADDRESSING_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  OperationAt1_50                     :  1; ///< Bits 0:0
+    UINT8  OperationAt1_35                     :  1; ///< Bits 1:1
+    UINT8  OperationAt1_25                     :  1; ///< Bits 2:2
+    UINT8  Reserved                            :  5; ///< Bits 7:3
+  } Bits;
+  UINT8  Data;
+} SPD3_MODULE_NOMINAL_VOLTAGE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
+    UINT8  RankCount                           :  3; ///< Bits 5:3
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_MODULE_ORGANIZATION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
+    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
+    UINT8  Reserved                            :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD3_MODULE_MEMORY_BUS_WIDTH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Divisor                             :  4; ///< Bits 3:0
+    UINT8  Dividend                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_FINE_TIMEBASE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Dividend                            :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_MEDIUM_TIMEBASE_DIVIDEND_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Divisor                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_MEDIUM_TIMEBASE_DIVISOR_STRUCT;
+
+typedef struct {
+  SPD3_MEDIUM_TIMEBASE_DIVIDEND_STRUCT Dividend; ///< Medium Timebase (MTB) Dividend
+  SPD3_MEDIUM_TIMEBASE_DIVISOR_STRUCT  Divisor;  ///< Medium Timebase (MTB) Divisor
+} SPD3_MEDIUM_TIMEBASE;
+
+typedef union {
+  struct {
+    UINT8  tCKmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TCK_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT16 Cl4                                 :  1; ///< Bits 0:0
+    UINT16 Cl5                                 :  1; ///< Bits 1:1
+    UINT16 Cl6                                 :  1; ///< Bits 2:2
+    UINT16 Cl7                                 :  1; ///< Bits 3:3
+    UINT16 Cl8                                 :  1; ///< Bits 4:4
+    UINT16 Cl9                                 :  1; ///< Bits 5:5
+    UINT16 Cl10                                :  1; ///< Bits 6:6
+    UINT16 Cl11                                :  1; ///< Bits 7:7
+    UINT16 Cl12                                :  1; ///< Bits 8:8
+    UINT16 Cl13                                :  1; ///< Bits 9:9
+    UINT16 Cl14                                :  1; ///< Bits 10:10
+    UINT16 Cl15                                :  1; ///< Bits 11:11
+    UINT16 Cl16                                :  1; ///< Bits 12:12
+    UINT16 Cl17                                :  1; ///< Bits 13:13
+    UINT16 Cl18                                :  1; ///< Bits 14:14
+    UINT16 Reserved                            :  1; ///< Bits 15:15
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD3_CAS_LATENCIES_SUPPORTED_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tAAmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TAA_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWRmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TWR_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRCDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRCD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRRDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRRD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRPmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRP_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRASminUpper                        :  4; ///< Bits 3:0
+    UINT8  tRCminUpper                         :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_TRAS_TRC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRASmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRAS_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRCmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT16 tRFCmin                             :  16; ///< Bits 15:0
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD3_TRFC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWTRmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TWTR_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRTPmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TRTP_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tFAWminUpper                        :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_TFAW_MIN_MTB_UPPER_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tFAWmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_TFAW_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Rzq6                                :  1; ///< Bits 0:0
+    UINT8  Rzq7                                :  1; ///< Bits 1:1
+    UINT8  Reserved                            :  5; ///< Bits 6:2
+    UINT8  DllOff                              :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_SDRAM_OPTIONAL_FEATURES_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ExtendedTemperatureRange            :  1; ///< Bits 0:0
+    UINT8  ExtendedTemperatureRefreshRate      :  1; ///< Bits 1:1
+    UINT8  AutoSelfRefresh                     :  1; ///< Bits 2:2
+    UINT8  OnDieThermalSensor                  :  1; ///< Bits 3:3
+    UINT8  Reserved                            :  3; ///< Bits 6:4
+    UINT8  PartialArraySelfRefresh             :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_SDRAM_THERMAL_REFRESH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ThermalSensorAccuracy               :  7; ///< Bits 6:0
+    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_MODULE_THERMAL_SENSOR_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SignalLoading                       :  2; ///< Bits 1:0
+    UINT8  Reserved                            :  2; ///< Bits 3:2
+    UINT8  DieCount                            :  3; ///< Bits 6:4
+    UINT8  SdramDeviceType                     :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_SDRAM_DEVICE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCKminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD3_TCK_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tAAminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD3_TAA_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRCDminFine                          :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD3_TRCD_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRPminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD3_TRP_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRCminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD3_TRC_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
+    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
+    UINT8  VendorSpecific                      :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_MAXIMUM_ACTIVE_COUNT_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Height                              :  5; ///< Bits 4:0
+    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD3_UNBUF_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                      :  4; ///< Bits 3:0
+    UINT8  BackThickness                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_UNBUF_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_UNBUF_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  MappingRank1                        :  1; ///< Bits 0:0
+    UINT8  Reserved                            :  7; ///< Bits 7:1
+  } Bits;
+  UINT8  Data;
+} SPD3_UNBUF_ADDRESS_MAPPING;
+
+typedef union {
+  struct {
+    UINT8  Height                              :  5; ///< Bits 4:0
+    UINT8  Reserved                            :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                      :  4; ///< Bits 3:0
+    UINT8  BackThickness                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  RegisterCount                       :  2; ///< Bits 1:0
+    UINT8  DramRowCount                        :  2; ///< Bits 3:2
+    UINT8  RegisterType                        :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_MODULE_ATTRIBUTES;
+
+typedef union {
+  struct {
+    UINT8  HeatSpreaderThermalCharacteristics  :  7; ///< Bits 6:0
+    UINT8  HeatSpreaderSolution                :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
+
+typedef union {
+  struct {
+    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
+    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
+    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD3_MANUFACTURER_ID_CODE;
+
+typedef union {
+  struct {
+    UINT8  RegisterRevisionNumber;             ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REGISTER_REVISION_NUMBER;
+
+typedef union {
+  struct {
+    UINT8 Bit0                                :  1; ///< Bits 0:0
+    UINT8 Bit1                                :  1; ///< Bits 1:1
+    UINT8 Bit2                                :  1; ///< Bits 2:2
+    UINT8 Reserved                            :  5; ///< Bits 7:3
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REGISTER_TYPE;
+
+typedef union {
+  struct {
+    UINT8 Reserved                            :  4; ///< Bits 0:3
+    UINT8 CommandAddressAOutputs              :  2; ///< Bits 5:4
+    UINT8 CommandAddressBOutputs              :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REGISTER_CONTROL_COMMAND_ADDRESS;
+
+typedef union {
+  struct {
+    UINT8 ControlSignalsAOutputs              :  2; ///< Bits 0:1
+    UINT8 ControlSignalsBOutputs              :  2; ///< Bits 3:2
+    UINT8 Y1Y3ClockOutputs                    :  2; ///< Bits 5:4
+    UINT8 Y0Y2ClockOutputs                    :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REGISTER_CONTROL_CONTROL_CLOCK;
+
+typedef union {
+  struct {
+    UINT8 Reserved0                           :  4; ///< Bits 0:3
+    UINT8 Reserved1                           :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_RDIMM_REGISTER_CONTROL_RESERVED;
+
+typedef union {
+  struct {
+    UINT8  Height                             :  5; ///< Bits 4:0
+    UINT8  Reserved                           :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                     :  4; ///< Bits 3:0
+    UINT8  BackThickness                      :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                               :  5; ///< Bits 4:0
+    UINT8  Revision                           :  2; ///< Bits 6:5
+    UINT8  Extension                          :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  RegisterCount                      :  2; ///< Bits 1:0
+    UINT8  DramRowCount                       :  2; ///< Bits 3:2
+    UINT8  RegisterType                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MODULE_ATTRIBUTES;
+
+typedef union {
+  struct {
+    UINT8 AddressCommandPrelaunch             :  1; ///< Bits 0:0
+    UINT8 Rank1Rank5Swap                      :  1; ///< Bits 1:1
+    UINT8 Reserved0                           :  1; ///< Bits 2:2
+    UINT8 Reserved1                           :  1; ///< Bits 3:3
+    UINT8 AddressCommandOutputs               :  2; ///< Bits 5:4
+    UINT8 QxCS_nOutputs                       :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_TIMING_CONTROL_DRIVE_STRENGTH;
+
+typedef union {
+  struct {
+    UINT8 QxOdtOutputs                        :  2; ///< Bits 1:0
+    UINT8 QxCkeOutputs                        :  2; ///< Bits 3:2
+    UINT8 Y1Y3ClockOutputs                    :  2; ///< Bits 5:4
+    UINT8 Y0Y2ClockOutputs                    :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_TIMING_DRIVE_STRENGTH;
+
+typedef union {
+  struct {
+    UINT8 YExtendedDelay                      :  2; ///< Bits 1:0
+    UINT8 QxCS_n                              :  2; ///< Bits 3:2
+    UINT8 QxOdt                               :  2; ///< Bits 5:4
+    UINT8 QxCke                               :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_EXTENDED_DELAY;
+
+typedef union {
+  struct {
+    UINT8 DelayY                              :  3; ///< Bits 2:0
+    UINT8 Reserved                            :  1; ///< Bits 3:3
+    UINT8 QxCS_n                              :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXCS_N_QXCA;
+
+typedef union {
+  struct {
+    UINT8 QxCS_n                              :  4; ///< Bits 3:0
+    UINT8 QxOdt                               :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXODT_QXCKE;
+
+typedef union {
+  struct {
+    UINT8 RC8MdqOdtStrength                   :  3; ///< Bits 2:0
+    UINT8 RC8Reserved                         :  1; ///< Bits 3:3
+    UINT8 RC9MdqOdtStrength                   :  3; ///< Bits 6:4
+    UINT8 RC9Reserved                         :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH;
+
+typedef union {
+  struct {
+    UINT8 RC10DA3ValueR0                      :  1; ///< Bits 0:0
+    UINT8 RC10DA4ValueR0                      :  1; ///< Bits 1:1
+    UINT8 RC10DA3ValueR1                      :  1; ///< Bits 2:2
+    UINT8 RC10DA4ValueR1                      :  1; ///< Bits 3:3
+    UINT8 RC11DA3ValueR0                      :  1; ///< Bits 4:4
+    UINT8 RC11DA4ValueR0                      :  1; ///< Bits 5:5
+    UINT8 RC11DA3ValueR1                      :  1; ///< Bits 6:6
+    UINT8 RC11DA4ValueR1                      :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL;
+
+typedef union {
+  struct {
+    UINT8 Driver_Impedance                    :  2; ///< Bits 1:0
+    UINT8 Rtt_Nom                             :  3; ///< Bits 4:2
+    UINT8 Reserved                            :  1; ///< Bits 5:5
+    UINT8 Rtt_WR                              :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MR_1_2;
+
+typedef union {
+  struct {
+    UINT8 MinimumDelayTime                    :  7; ///< Bits 0:6
+    UINT8 Reserved                            :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD3_LRDIMM_MODULE_DELAY_TIME;
+
+typedef struct {
+  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
+  UINT8  Week;                                 ///< Year represented in BCD (47h = week 47)
+} SPD3_MANUFACTURING_DATE;
+
+typedef union {
+  UINT32 Data;
+  UINT16 SerialNumber16[2];
+  UINT8  SerialNumber8[4];
+} SPD3_MANUFACTURER_SERIAL_NUMBER;
+
+typedef struct {
+  UINT8 Location;                              ///< Module Manufacturing Location
+} SPD3_MANUFACTURING_LOCATION;
+
+typedef struct {
+  SPD3_MANUFACTURER_ID_CODE            IdCode;                   ///< Module Manufacturer ID Code
+  SPD3_MANUFACTURING_LOCATION          Location;                 ///< Module Manufacturing Location
+  SPD3_MANUFACTURING_DATE              Date;                     ///< Module Manufacturing Year, in BCD (range: 2000-2255)
+  SPD3_MANUFACTURER_SERIAL_NUMBER      SerialNumber;             ///< Module Serial Number
+} SPD3_UNIQUE_MODULE_ID;
+
+typedef union {
+  UINT16 Crc[1];
+  UINT8  Data8[2];
+} SPD3_CYCLIC_REDUNDANCY_CODE;
+
+typedef struct {
+  SPD3_DEVICE_DESCRIPTION_STRUCT       Description;              ///< 0   Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
+  SPD3_REVISION_STRUCT                 Revision;                 ///< 1   SPD Revision
+  SPD3_DRAM_DEVICE_TYPE_STRUCT         DramDeviceType;           ///< 2   DRAM Device Type
+  SPD3_MODULE_TYPE_STRUCT              ModuleType;               ///< 3   Module Type
+  SPD3_SDRAM_DENSITY_BANKS_STRUCT      SdramDensityAndBanks;     ///< 4   SDRAM Density and Banks
+  SPD3_SDRAM_ADDRESSING_STRUCT         SdramAddressing;          ///< 5   SDRAM Addressing
+  SPD3_MODULE_NOMINAL_VOLTAGE_STRUCT   ModuleNominalVoltage;     ///< 6   Module Nominal Voltage, VDD
+  SPD3_MODULE_ORGANIZATION_STRUCT      ModuleOrganization;       ///< 7   Module Organization
+  SPD3_MODULE_MEMORY_BUS_WIDTH_STRUCT  ModuleMemoryBusWidth;     ///< 8   Module Memory Bus Width
+  SPD3_FINE_TIMEBASE_STRUCT            FineTimebase;             ///< 9   Fine Timebase (FTB) Dividend / Divisor
+  SPD3_MEDIUM_TIMEBASE                 MediumTimebase;           ///< 10-11 Medium Timebase (MTB) Dividend
+  SPD3_TCK_MIN_MTB_STRUCT              tCKmin;                   ///< 12  SDRAM Minimum Cycle Time (tCKmin)
+  UINT8                                Reserved0;                ///< 13  Reserved
+  SPD3_CAS_LATENCIES_SUPPORTED_STRUCT  CasLatencies;             ///< 14-15 CAS Latencies Supported
+  SPD3_TAA_MIN_MTB_STRUCT              tAAmin;                   ///< 16  Minimum CAS Latency Time (tAAmin)
+  SPD3_TWR_MIN_MTB_STRUCT              tWRmin;                   ///< 17  Minimum Write Recovery Time (tWRmin)
+  SPD3_TRCD_MIN_MTB_STRUCT             tRCDmin;                  ///< 18  Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD3_TRRD_MIN_MTB_STRUCT             tRRDmin;                  ///< 19  Minimum Row Active to Row Active Delay Time (tRRDmin)
+  SPD3_TRP_MIN_MTB_STRUCT              tRPmin;                   ///< 20  Minimum Row Precharge Delay Time (tRPmin)
+  SPD3_TRAS_TRC_MIN_MTB_STRUCT         tRASMintRCMinUpper;       ///< 21  Upper Nibbles for tRAS and tRC
+  SPD3_TRAS_MIN_MTB_STRUCT             tRASmin;                  ///< 22  Minimum Active to Precharge Delay Time (tRASmin), Least Significant Byte
+  SPD3_TRC_MIN_MTB_STRUCT              tRCmin;                   ///< 23  Minimum Active to Active/Refresh Delay Time (tRCmin), Least Significant Byte
+  SPD3_TRFC_MIN_MTB_STRUCT             tRFCmin;                  ///< 24-25  Minimum Refresh Recovery Delay Time (tRFCmin)
+  SPD3_TWTR_MIN_MTB_STRUCT             tWTRmin;                  ///< 26  Minimum Internal Write to Read Command Delay Time (tWTRmin)
+  SPD3_TRTP_MIN_MTB_STRUCT             tRTPmin;                  ///< 27  Minimum Internal Read to Precharge Command Delay Time (tRTPmin)
+  SPD3_TFAW_MIN_MTB_UPPER_STRUCT       tFAWMinUpper;             ///< 28  Upper Nibble for tFAW
+  SPD3_TFAW_MIN_MTB_STRUCT             tFAWmin;                  ///< 29  Minimum Four Activate Window Delay Time (tFAWmin)
+  SPD3_SDRAM_OPTIONAL_FEATURES_STRUCT  SdramOptionalFeatures;    ///< 30  SDRAM Optional Features
+  SPD3_SDRAM_THERMAL_REFRESH_STRUCT    ThermalAndRefreshOptions; ///< 31  SDRAM Thermal And Refresh Options
+  SPD3_MODULE_THERMAL_SENSOR_STRUCT    ModuleThermalSensor;      ///< 32  Module Thermal Sensor
+  SPD3_SDRAM_DEVICE_TYPE_STRUCT        SdramDeviceType;          ///< 33  SDRAM Device Type
+  SPD3_TCK_MIN_FTB_STRUCT              tCKminFine;               ///< 34  Fine Offset for SDRAM Minimum Cycle Time (tCKmin)
+  SPD3_TAA_MIN_FTB_STRUCT              tAAminFine;               ///< 35  Fine Offset for Minimum CAS Latency Time (tAAmin)
+  SPD3_TRCD_MIN_FTB_STRUCT             tRCDminFine;              ///< 36  Fine Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD3_TRP_MIN_FTB_STRUCT              tRPminFine;               ///< 37  Minimum Row Precharge Delay Time (tRPmin)
+  SPD3_TRC_MIN_FTB_STRUCT              tRCminFine;               ///< 38  Fine Offset for Minimum Active to Active/Refresh Delay Time (tRCmin)
+  UINT8                                Reserved1[40 - 39 + 1];   ///< 39 - 40 Reserved
+  SPD3_MAXIMUM_ACTIVE_COUNT_STRUCT     MacValue;                 ///< 41  SDRAM Maximum Active Count (MAC) Value
+  UINT8                                Reserved2[59 - 42 + 1];   ///< 42 - 59 Reserved
+} SPD3_BASE_SECTION;
+
+typedef struct {
+  SPD3_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;      ///< 60  Module Nominal Height
+  SPD3_UNBUF_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness;   ///< 61  Module Maximum Thickness
+  SPD3_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;     ///< 62  Reference Raw Card Used
+  SPD3_UNBUF_ADDRESS_MAPPING           AddressMappingEdgeConn;   ///< 63  Address Mapping from Edge Connector to DRAM
+  UINT8                                Reserved[116 - 64 + 1];   ///< 64-116 Reserved
+} SPD3_MODULE_UNBUFFERED;
+
+typedef struct {
+  SPD3_RDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;      ///< 60  Module Nominal Height
+  SPD3_RDIMM_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness;   ///< 61  Module Maximum Thickness
+  SPD3_RDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;     ///< 62  Reference Raw Card Used
+  SPD3_RDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;     ///< 63  DIMM Module Attributes
+  SPD3_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION       ThermalHeatSpreaderSolution; ///< 64     RDIMM Thermal Heat Spreader Solution
+  SPD3_MANUFACTURER_ID_CODE                       RegisterManufacturerIdCode;  ///< 65-66  Register Manufacturer ID Code
+  SPD3_RDIMM_REGISTER_REVISION_NUMBER             RegisterRevisionNumber;      ///< 67     Register Revision Number
+  SPD3_RDIMM_REGISTER_TYPE                        RegisterType; ///< 68  Register Type
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc1Rc0;       ///< 69  RC1 (MS Nibble) / RC0 (LS Nibble) - Reserved
+  SPD3_RDIMM_REGISTER_CONTROL_COMMAND_ADDRESS     Rc3Rc2;       ///< 70  RC3 (MS Nibble) / RC2 (LS Nibble) - Drive Strength, Command/Address
+  SPD3_RDIMM_REGISTER_CONTROL_CONTROL_CLOCK       Rc5Rc4;       ///< 71  RC5 (MS Nibble) / RC4 (LS Nibble) - Drive Strength, Control and Clock
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc7Rc6;       ///< 72  RC7 (MS Nibble) / RC6 (LS Nibble) - Reserved for Register Vendor
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc9Rc8;       ///< 73  RC9 (MS Nibble) / RC8 (LS Nibble) - Reserved
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc11Rc10;     ///< 74  RC11 (MS Nibble) / RC10 (LS Nibble) - Reserved
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc13Rc12;     ///< 75  RC12 (MS Nibble) / RC12 (LS Nibble) - Reserved
+  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc15Rc14;     ///< 76  RC15 (MS Nibble) / RC14 (LS Nibble) - Reserved
+  UINT8                               Reserved[116 - 77 + 1];   ///< 77-116 Reserved
+} SPD3_MODULE_REGISTERED;
+
+typedef struct {
+  SPD3_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;     ///< 60  Module Nominal Height
+  SPD3_UNBUF_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness;  ///< 61  Module Maximum Thickness
+  SPD3_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;    ///< 62  Reference Raw Card Used
+  UINT8                                Reserved[116 - 63 + 1];  ///< 63-116 Reserved
+} SPD3_MODULE_CLOCKED;
+
+typedef struct {
+  SPD3_LRDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;    ///< 60  Module Nominal Height
+  SPD3_LRDIMM_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness; ///< 61  Module Maximum Thickness
+  SPD3_LRDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;   ///< 62  Reference Raw Card Used
+  SPD3_LRDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;   ///< 63  Module Attributes
+  UINT8                                         MemoryBufferRevisionNumber;       ///< 64    Memory Buffer Revision Number
+  SPD3_MANUFACTURER_ID_CODE                     ManufacturerIdCode;               ///< 65-66 Memory Buffer Manufacturer ID Code
+  SPD3_LRDIMM_TIMING_CONTROL_DRIVE_STRENGTH     TimingControlDriveStrengthCaCs;   ///< 67    F0RC3 / F0RC2 - Timing Control & Drive Strength, CA & CS
+  SPD3_LRDIMM_TIMING_DRIVE_STRENGTH             DriveStrength;                    ///< 68    F0RC5 / F0RC4 - Drive Strength, ODT & CKE and Y
+  SPD3_LRDIMM_EXTENDED_DELAY                    ExtendedDelay;                    ///< 69    F1RC11 / F1RC8 - Extended Delay for Y, CS and ODT & CKE
+  SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXCS_N_QXCA    AdditiveDelayForCsCa;             ///< 70    F1RC13 / F1RC12 - Additive Delay for CS and CA
+  SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXODT_QXCKE    AdditiveDelayForOdtCke;           ///< 71    F1RC15 / F1RC14 - Additive Delay for ODT & CKE
+  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH    MdqTerminationDriveStrengthFor800_1066; ///< 72    F1RC15 / F1RC14 - Additive Delay for ODT & CKE
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_0_1QxOdtControlFor800_1066;  ///< 73    F[3,4]RC11 / F[3,4]RC10 - Rank 0 & 1 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_2_3QxOdtControlFor800_1066;  ///< 74    F[5,6]RC11 / F[5,6]RC10 - Rank 2 & 3 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_4_5QxOdtControlFor800_1066;  ///< 75    F[7,8]RC11 / F[7,8]RC10 - Rank 4 & 5 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_6_7QxOdtControlFor800_1066;  ///< 76    F[9,10]RC11 / F[9,10]RC10 - Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor800_1066;       ///< 77    MR1,2 Registers for 800 & 1066
+  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH    MdqTerminationDriveStrengthFor1333_1600; ///< 78    F1RC15 / F1RC14 - Additive Delay for ODT & CKE
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_0_1QxOdtControlFor1333_1600; ///< 79    F[3,4]RC11 / F[3,4]RC10 - Rank 0 & 1 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_2_3QxOdtControlFor1333_1600; ///< 80    F[5,6]RC11 / F[5,6]RC10 - Rank 2 & 3 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_4_5QxOdtControlFor1333_1600; ///< 81    F[7,8]RC11 / F[7,8]RC10 - Rank 4 & 5 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_6_7QxOdtControlFor1333_1600; ///< 82    F[9,10]RC11 / F[9,10]RC10 - Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor1333_1600;      ///< 83    MR1,2 Registers for 800 & 1066
+  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH    MdqTerminationDriveStrengthFor1866_2133; ///< 84    F1RC15 / F1RC14 - Additive Delay for ODT & CKE
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_0_1QxOdtControlFor1866_2133; ///< 85    F[3,4]RC11 / F[3,4]RC10 - Rank 0 & 1 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_2_3QxOdtControlFor1866_2133; ///< 86    F[5,6]RC11 / F[5,6]RC10 - Rank 2 & 3 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_4_5QxOdtControlFor1866_2133; ///< 87    F[7,8]RC11 / F[7,8]RC10 - Rank 4 & 5 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL     Rank_6_7QxOdtControlFor1866_2133; ///< 88    F[9,10]RC11 / F[9,10]RC10 - Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
+  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor1866_2133;      ///< 89    MR1,2 Registers for 800 & 1066
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MinimumModuleDelayTimeFor1_5V;    ///< 90    Minimum Module Delay Time for 1.5 V
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MaximumModuleDelayTimeFor1_5V;    ///< 91    Maximum Module Delay Time for 1.5 V
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MinimumModuleDelayTimeFor1_35V;   ///< 92    Minimum Module Delay Time for 1.35 V
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MaximumModuleDelayTimeFor1_35V;   ///< 93    Maximum Module Delay Time for 1.35 V
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MinimumModuleDelayTimeFor1_25V;   ///< 94    Minimum Module Delay Time for 1.25 V
+  SPD3_LRDIMM_MODULE_DELAY_TIME                 MaximumModuleDelayTimeFor1_25V;   ///< 95    Maximum Module Delay Time for 1.25 V
+  UINT8                                         Reserved[101 - 96 + 1];           ///< 96-101  Reserved
+  UINT8                                         PersonalityByte[116 - 102 + 1];   ///< 102-116 Memory Buffer Personality Bytes
+} SPD3_MODULE_LOADREDUCED;
+
+typedef union {
+  SPD3_MODULE_UNBUFFERED              Unbuffered;               ///< 128-255 Unbuffered Memory Module Types
+  SPD3_MODULE_REGISTERED              Registered;               ///< 128-255 Registered Memory Module Types
+  SPD3_MODULE_CLOCKED                 Clocked;                  ///< 128-255 Registered Memory Module Types
+  SPD3_MODULE_LOADREDUCED             LoadReduced;              ///< 128-255 Load Reduced Memory Module Types
+} SPD3_MODULE_SPECIFIC;
+
+typedef struct {
+  UINT8                          ModulePartNumber[145 - 128 + 1];        ///< 128-145 Module Part Number
+} SPD3_MODULE_PART_NUMBER;
+
+typedef struct {
+  UINT8                          ModuleRevisionCode[147 - 146 + 1];      ///< 146-147 Module Revision Code
+} SPD3_MODULE_REVISION_CODE;
+
+typedef struct {
+  UINT8                          ManufacturerSpecificData[175 - 150 + 1];///< 150-175 Manufacturer's Specific Data
+} SPD3_MANUFACTURER_SPECIFIC;
+
+///
+/// DDR3 Serial Presence Detect structure
+///
+typedef struct {
+  SPD3_BASE_SECTION           General;                                ///< 0-59    General Section
+  SPD3_MODULE_SPECIFIC        Module;                                 ///< 60-116  Module-Specific Section
+  SPD3_UNIQUE_MODULE_ID       ModuleId;                               ///< 117-125 Unique Module ID
+  SPD3_CYCLIC_REDUNDANCY_CODE Crc;                                    ///< 126-127 Cyclical Redundancy Code (CRC)
+  SPD3_MODULE_PART_NUMBER     ModulePartNumber;                       ///< 128-145 Module Part Number
+  SPD3_MODULE_REVISION_CODE   ModuleRevisionCode;                     ///< 146-147 Module Revision Code
+  SPD3_MANUFACTURER_ID_CODE   DramIdCode;                             ///< 148-149 Dram Manufacturer ID Code
+  SPD3_MANUFACTURER_SPECIFIC  ManufacturerSpecificData;               ///< 150-175 Manufacturer's Specific Data
+  UINT8                       Reserved[255 - 176 + 1];                ///< 176-255 Open for Customer Use
+} SPD_DDR3;
+
+#pragma pack (pop)
+#endif
diff --git a/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h b/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
new file mode 100644
index 0000000..0eabb6c
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
@@ -0,0 +1,958 @@
+/** @file
+  This file contains definitions for SPD DDR4.
+
+  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  @par Revision Reference:
+    - Serial Presence Detect (SPD) for DDR4 SDRAM Modules Document Release 4
+      http://www.jedec.org/standards-documents/docs/spd412l-4
+**/
+
+#ifndef _SDRAM_SPD_DDR4_H_
+#define _SDRAM_SPD_DDR4_H_
+
+#pragma pack (push, 1)
+
+typedef union {
+  struct {
+    UINT8  BytesUsed                           :  4; ///< Bits 3:0
+    UINT8  BytesTotal                          :  3; ///< Bits 6:4
+    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_DEVICE_DESCRIPTION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Minor                               :  4; ///< Bits 3:0
+    UINT8  Major                               :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_REVISION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Type                                :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_DRAM_DEVICE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ModuleType                          :  4; ///< Bits 3:0
+    UINT8  HybridMedia                         :  3; ///< Bits 6:4
+    UINT8  Hybrid                              :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_MODULE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Density                             :  4; ///< Bits 3:0
+    UINT8  BankAddress                         :  2; ///< Bits 5:4
+    UINT8  BankGroup                           :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_SDRAM_DENSITY_BANKS_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
+    UINT8  RowAddress                          :  3; ///< Bits 5:3
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_SDRAM_ADDRESSING_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SignalLoading                       :  2; ///< Bits 1:0
+    UINT8  Reserved                            :  2; ///< Bits 3:2
+    UINT8  DieCount                            :  3; ///< Bits 6:4
+    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_PRIMARY_SDRAM_PACKAGE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
+    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_SDRAM_OPTIONAL_FEATURES_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_SDRAM_THERMAL_REFRESH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  5; ///< Bits 4:0
+    UINT8  SoftPPR                             :  1; ///< Bits 5:5
+    UINT8  PostPackageRepair                   :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SignalLoading                       :  2; ///< Bits 1:0
+    UINT8  DRAMDensityRatio                    :  2; ///< Bits 3:2
+    UINT8  DieCount                            :  3; ///< Bits 6:4
+    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_SECONDARY_SDRAM_PACKAGE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  OperationAt1_20                     :  1; ///< Bits 0:0
+    UINT8  EndurantAt1_20                      :  1; ///< Bits 1:1
+    UINT8  Reserved                            :  6; ///< Bits 7:2
+  } Bits;
+  UINT8  Data;
+} SPD4_MODULE_NOMINAL_VOLTAGE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
+    UINT8  RankCount                           :  3; ///< Bits 5:3
+    UINT8  RankMix                             :  1; ///< Bits 6:6
+    UINT8  Reserved                            :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_MODULE_ORGANIZATION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
+    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
+    UINT8  Reserved                            :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD4_MODULE_MEMORY_BUS_WIDTH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  7; ///< Bits 6:0
+    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_MODULE_THERMAL_SENSOR_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ExtendedBaseModuleType              :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_EXTENDED_MODULE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Fine                                :  2; ///< Bits 1:0
+    UINT8  Medium                              :  2; ///< Bits 3:2
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_TIMEBASE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tCKmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TCK_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tCKmax                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TCK_MAX_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT32 Cl7                                 :  1; ///< Bits 0:0
+    UINT32 Cl8                                 :  1; ///< Bits 1:1
+    UINT32 Cl9                                 :  1; ///< Bits 2:2
+    UINT32 Cl10                                :  1; ///< Bits 3:3
+    UINT32 Cl11                                :  1; ///< Bits 4:4
+    UINT32 Cl12                                :  1; ///< Bits 5:5
+    UINT32 Cl13                                :  1; ///< Bits 6:6
+    UINT32 Cl14                                :  1; ///< Bits 7:7
+    UINT32 Cl15                                :  1; ///< Bits 8:8
+    UINT32 Cl16                                :  1; ///< Bits 9:9
+    UINT32 Cl17                                :  1; ///< Bits 10:10
+    UINT32 Cl18                                :  1; ///< Bits 11:11
+    UINT32 Cl19                                :  1; ///< Bits 12:12
+    UINT32 Cl20                                :  1; ///< Bits 13:13
+    UINT32 Cl21                                :  1; ///< Bits 14:14
+    UINT32 Cl22                                :  1; ///< Bits 15:15
+    UINT32 Cl23                                :  1; ///< Bits 16:16
+    UINT32 Cl24                                :  1; ///< Bits 17:17
+    UINT32 Cl25                                :  1; ///< Bits 18:18
+    UINT32 Cl26                                :  1; ///< Bits 19:19
+    UINT32 Cl27                                :  1; ///< Bits 20:20
+    UINT32 Cl28                                :  1; ///< Bits 21:21
+    UINT32 Cl29                                :  1; ///< Bits 22:22
+    UINT32 Cl30                                :  1; ///< Bits 23:23
+    UINT32 Cl31                                :  1; ///< Bits 24:24
+    UINT32 Cl32                                :  1; ///< Bits 25:25
+    UINT32 Cl33                                :  1; ///< Bits 26:26
+    UINT32 Cl34                                :  1; ///< Bits 27:27
+    UINT32 Cl35                                :  1; ///< Bits 28:28
+    UINT32 Cl36                                :  1; ///< Bits 29:29
+    UINT32 Reserved                            :  1; ///< Bits 30:30
+    UINT32 ClRange                             :  1; ///< Bits 31:31
+  } Bits;
+  struct {
+    UINT32 Cl23                                :  1; ///< Bits 0:0
+    UINT32 Cl24                                :  1; ///< Bits 1:1
+    UINT32 Cl25                                :  1; ///< Bits 2:2
+    UINT32 Cl26                                :  1; ///< Bits 3:3
+    UINT32 Cl27                                :  1; ///< Bits 4:4
+    UINT32 Cl28                                :  1; ///< Bits 5:5
+    UINT32 Cl29                                :  1; ///< Bits 6:6
+    UINT32 Cl30                                :  1; ///< Bits 7:7
+    UINT32 Cl31                                :  1; ///< Bits 8:8
+    UINT32 Cl32                                :  1; ///< Bits 9:9
+    UINT32 Cl33                                :  1; ///< Bits 10:10
+    UINT32 Cl34                                :  1; ///< Bits 11:11
+    UINT32 Cl35                                :  1; ///< Bits 12:12
+    UINT32 Cl36                                :  1; ///< Bits 13:13
+    UINT32 Cl37                                :  1; ///< Bits 14:14
+    UINT32 Cl38                                :  1; ///< Bits 15:15
+    UINT32 Cl39                                :  1; ///< Bits 16:16
+    UINT32 Cl40                                :  1; ///< Bits 17:17
+    UINT32 Cl41                                :  1; ///< Bits 18:18
+    UINT32 Cl42                                :  1; ///< Bits 19:19
+    UINT32 Cl43                                :  1; ///< Bits 20:20
+    UINT32 Cl44                                :  1; ///< Bits 21:21
+    UINT32 Cl45                                :  1; ///< Bits 22:22
+    UINT32 Cl46                                :  1; ///< Bits 23:23
+    UINT32 Cl47                                :  1; ///< Bits 24:24
+    UINT32 Cl48                                :  1; ///< Bits 25:25
+    UINT32 Cl49                                :  1; ///< Bits 26:26
+    UINT32 Cl50                                :  1; ///< Bits 27:27
+    UINT32 Cl51                                :  1; ///< Bits 28:28
+    UINT32 Cl52                                :  1; ///< Bits 29:29
+    UINT32 Reserved                            :  1; ///< Bits 30:30
+    UINT32 ClRange                             :  1; ///< Bits 31:31
+  } HighRangeBits;
+  UINT32 Data;
+  UINT16 Data16[2];
+  UINT8  Data8[4];
+} SPD4_CAS_LATENCIES_SUPPORTED_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tAAmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TAA_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRCDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TRCD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRPmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TRP_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRASminUpper                        :  4; ///< Bits 3:0
+    UINT8  tRCminUpper                         :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_TRAS_TRC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRASmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TRAS_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRCmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TRC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT16 tRFCmin                             :  16; ///< Bits 15:0
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD4_TRFC_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tFAWminUpper                        :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_TFAW_MIN_MTB_UPPER_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tFAWmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TFAW_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRRDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TRRD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tCCDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TCCD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWRminMostSignificantNibble         :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_TWR_UPPER_NIBBLE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWRmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TWR_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWTR_SminMostSignificantNibble      :  4; ///< Bits 3:0
+    UINT8  tWTR_LminMostSignificantNibble      :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_TWTR_UPPER_NIBBLE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tWTRmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_TWTR_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  BitOrderatSDRAM                     :  5; ///< Bits 4:0
+    UINT8  WiredtoUpperLowerNibble             :  1; ///< Bits 5:5
+    UINT8  PackageRankMap                      :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_CONNECTOR_BIT_MAPPING_BYTE_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCCDminFine                          :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TCCD_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRRDminFine                          :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TRRD_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRCminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TRC_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRPminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TRP_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRCDminFine                          :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TRCD_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tAAminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TAA_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCKmaxFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TCK_MAX_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCKminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD4_TCK_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Height                              :  5; ///< Bits 4:0
+    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD4_UNBUF_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                      :  4; ///< Bits 3:0
+    UINT8  BackThickness                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_UNBUF_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_UNBUF_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  MappingRank1                        :  1; ///< Bits 0:0
+    UINT8  Reserved                            :  7; ///< Bits 7:1
+  } Bits;
+  UINT8  Data;
+} SPD4_UNBUF_ADDRESS_MAPPING;
+
+typedef union {
+  struct {
+    UINT8  Height                              :  5; ///< Bits 4:0
+    UINT8  Reserved                            :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                      :  4; ///< Bits 3:0
+    UINT8  BackThickness                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  RegisterCount                       :  2; ///< Bits 1:0
+    UINT8  DramRowCount                        :  2; ///< Bits 3:2
+    UINT8  RegisterType                        :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_MODULE_ATTRIBUTES;
+
+typedef union {
+  struct {
+    UINT8  HeatSpreaderThermalCharacteristics  :  7; ///< Bits 6:0
+    UINT8  HeatSpreaderSolution                :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
+
+typedef union {
+  struct {
+    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
+    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
+    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD4_MANUFACTURER_ID_CODE;
+
+typedef union {
+  struct {
+    UINT8  RegisterRevisionNumber;             ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_REGISTER_REVISION_NUMBER;
+
+typedef union {
+  struct {
+    UINT8 Rank1Mapping                        :  1; ///< Bits 0:0
+    UINT8 Reserved                            :  7; ///< Bits 7:1
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM;
+
+typedef union {
+  struct {
+    UINT8 Cke                                 :  2; ///< Bits 1:0
+    UINT8 Odt                                 :  2; ///< Bits 3:2
+    UINT8 CommandAddress                      :  2; ///< Bits 5:4
+    UINT8 ChipSelect                          :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COMMAND_ADDRESS;
+
+typedef union {
+  struct {
+    UINT8 Y0Y2                                :  2; ///< Bits 1:0
+    UINT8 Y1Y3                                :  2; ///< Bits 3:2
+    UINT8 Reserved0                           :  2; ///< Bits 5:4
+    UINT8 RcdOutputSlewRateControl            :  1; ///< Bits 6:6
+    UINT8 Reserved1                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK;
+
+typedef union {
+  struct {
+    UINT8  Height                             :  5; ///< Bits 4:0
+    UINT8  Reserved                           :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                     :  4; ///< Bits 3:0
+    UINT8  BackThickness                      :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_MODULE_NOMINAL_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Card                               :  5; ///< Bits 4:0
+    UINT8  Revision                           :  2; ///< Bits 6:5
+    UINT8  Extension                          :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  RegisterCount                      :  2; ///< Bits 1:0
+    UINT8  DramRowCount                       :  2; ///< Bits 3:2
+    UINT8  RegisterType                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_MODULE_ATTRIBUTES;
+
+typedef union {
+  struct {
+    UINT8  HeatSpreaderThermalCharacteristics :  7; ///< Bits 6:0
+    UINT8  HeatSpreaderSolution               :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
+
+typedef union {
+  struct {
+    UINT8  RegisterRevisionNumber;                  ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_REGISTER_REVISION_NUMBER;
+
+typedef union {
+  struct {
+    UINT8 Rank1Mapping                        :  1; ///< Bits 0:0
+    UINT8 Reserved                            :  7; ///< Bits 7:1
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM;
+
+typedef union {
+  struct {
+    UINT8 Cke                                 :  2; ///< Bits 1:0
+    UINT8 Odt                                 :  2; ///< Bits 3:2
+    UINT8 CommandAddress                      :  2; ///< Bits 5:4
+    UINT8 ChipSelect                          :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COMMAND_ADDRESS;
+
+typedef union {
+  struct {
+    UINT8 Y0Y2                                :  2; ///< Bits 1:0
+    UINT8 Y1Y3                                :  2; ///< Bits 3:2
+    UINT8 Reserved0                           :  2; ///< Bits 5:4
+    UINT8 RcdOutputSlewRateControl            :  1; ///< Bits 6:6
+    UINT8 Reserved1                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK;
+
+typedef struct {
+  UINT8  DataBufferRevisionNumber;
+} SPD4_LRDIMM_DATA_BUFFER_REVISION_NUMBER;
+
+typedef union {
+  struct {
+    UINT8  DramVrefDQForPackageRank0          :  6; ///< Bits 5:0
+    UINT8  Reserved                           :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK;
+
+typedef struct {
+  UINT8  DataBufferVrefDQforDramInterface;
+} SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE;
+
+typedef union {
+  struct {
+    UINT8  DramInterfaceMdqDriveStrength           :  4; ///< Bits 3:0
+    UINT8  DramInterfaceMdqReadTerminationStrength :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_RATE;
+
+typedef union {
+  struct {
+    UINT8  DataRateLe1866                           :  2; ///< Bits 1:0
+    UINT8  DataRateLe2400                           :  2; ///< Bits 3:2
+    UINT8  DataRateLe3200                           :  2; ///< Bits 5:4
+    UINT8  Reserved                                 :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DRAM_DRIVE_STRENGTH;
+
+typedef union {
+  struct {
+    UINT8  Rtt_Nom                                  :  3; ///< Bits 2:0
+    UINT8  Rtt_WR                                   :  3; ///< Bits 5:3
+    UINT8  Reserved                                 :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE;
+
+typedef union {
+  struct {
+    UINT8  PackageRanks0_1                          :  3; ///< Bits 2:0
+    UINT8  PackageRanks2_3                          :  3; ///< Bits 5:3
+    UINT8  Reserved                                 :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE;
+
+typedef union {
+  struct {
+    UINT8  Rank0                                    :  1; ///< Bits 0:0
+    UINT8  Rank1                                    :  1; ///< Bits 1:1
+    UINT8  Rank2                                    :  1; ///< Bits 2:2
+    UINT8  Rank3                                    :  1; ///< Bits 3:3
+    UINT8  DataBuffer                               :  1; ///< Bits 4:4
+    UINT8  Reserved                                 :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE_RANGE;
+
+typedef union {
+  struct {
+    UINT8  DataBufferGainAdjustment                 :  1; ///< Bits 0:0
+    UINT8  DataBufferDfe                            :  1; ///< Bits 1:1
+    UINT8  Reserved                                 :  6; ///< Bits 7:2
+  } Bits;
+  UINT8  Data;
+} SPD4_LRDIMM_DATA_BUFFER_DQ_DECISION_FEEDBACK_EQUALIZATION;
+
+typedef UINT16 SPD4_NVDIMM_MODULE_PRODUCT_IDENTIFIER;
+
+typedef union {
+  struct {
+    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
+    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
+    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_MANUFACTURER_ID_CODE;
+
+typedef UINT16 SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_IDENTIFIER;
+
+typedef UINT8 SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_REVISION_CODE;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD4_NVDIMM_REFERENCE_RAW_CARD;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  4; ///< Bits 3:0
+    UINT8  Extension                           :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD4_NVDIMM_MODULE_CHARACTERISTICS;
+
+typedef struct {
+  UINT8  Reserved;
+  UINT8  MediaType;
+} SPD4_NVDIMM_HYBRID_MODULE_MEDIA_TYPES;
+
+typedef UINT8 SPD4_NVDIMM_MAXIMUM_NONVOLATILE_MEMORY_INITIALIZATION_TIME;
+
+typedef union {
+  struct {
+    UINT16 FunctionInterface                   :  5; ///< Bits 4:0
+    UINT16 FunctionClass                       :  5; ///< Bits 9:5
+    UINT16 BlockOffset                         :  4; ///< Bits 13:10
+    UINT16 Reserved                            :  1; ///< Bits 14:14
+    UINT16 Implemented                         :  1; ///< Bits 15:15
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD4_NVDIMM_FUNCTION_INTERFACE_DESCRIPTOR;
+
+typedef struct {
+  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
+  UINT8  Week;                                 ///< Year represented in BCD (47h = week 47)
+} SPD4_MANUFACTURING_DATE;
+
+typedef union {
+  UINT32 Data;
+  UINT16 SerialNumber16[2];
+  UINT8  SerialNumber8[4];
+} SPD4_MANUFACTURER_SERIAL_NUMBER;
+
+typedef struct {
+  UINT8 Location;                              ///< Module Manufacturing Location
+} SPD4_MANUFACTURING_LOCATION;
+
+typedef struct {
+  SPD4_MANUFACTURER_ID_CODE            IdCode;                   ///< Module Manufacturer ID Code
+  SPD4_MANUFACTURING_LOCATION          Location;                 ///< Module Manufacturing Location
+  SPD4_MANUFACTURING_DATE              Date;                     ///< Module Manufacturing Year, in BCD (range: 2000-2255)
+  SPD4_MANUFACTURER_SERIAL_NUMBER      SerialNumber;             ///< Module Serial Number
+} SPD4_UNIQUE_MODULE_ID;
+
+typedef union {
+  UINT16 Crc[1];
+  UINT8  Data8[2];
+} SPD4_CYCLIC_REDUNDANCY_CODE;
+
+typedef struct {
+  SPD4_DEVICE_DESCRIPTION_STRUCT            Description;              ///< 0       Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
+  SPD4_REVISION_STRUCT                      Revision;                 ///< 1       SPD Revision
+  SPD4_DRAM_DEVICE_TYPE_STRUCT              DramDeviceType;           ///< 2       DRAM Device Type
+  SPD4_MODULE_TYPE_STRUCT                   ModuleType;               ///< 3       Module Type
+  SPD4_SDRAM_DENSITY_BANKS_STRUCT           SdramDensityAndBanks;     ///< 4       SDRAM Density and Banks
+  SPD4_SDRAM_ADDRESSING_STRUCT              SdramAddressing;          ///< 5       SDRAM Addressing
+  SPD4_PRIMARY_SDRAM_PACKAGE_TYPE_STRUCT    PrimarySdramPackageType;  ///< 6       Primary SDRAM Package Type
+  SPD4_SDRAM_OPTIONAL_FEATURES_STRUCT       SdramOptionalFeatures;    ///< 7       SDRAM Optional Features
+  SPD4_SDRAM_THERMAL_REFRESH_STRUCT         ThermalAndRefreshOptions; ///< 8       SDRAM Thermal and Refresh Options
+  SPD4_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT OtherOptionalFeatures;    ///< 9       Other SDRAM Optional Features
+  SPD4_SECONDARY_SDRAM_PACKAGE_TYPE_STRUCT  SecondarySdramPackageType;///< 10      Secondary SDRAM Package Type
+  SPD4_MODULE_NOMINAL_VOLTAGE_STRUCT        ModuleNominalVoltage;     ///< 11      Module Nominal Voltage, VDD
+  SPD4_MODULE_ORGANIZATION_STRUCT           ModuleOrganization;       ///< 12      Module Organization
+  SPD4_MODULE_MEMORY_BUS_WIDTH_STRUCT       ModuleMemoryBusWidth;     ///< 13      Module Memory Bus Width
+  SPD4_MODULE_THERMAL_SENSOR_STRUCT         ModuleThermalSensor;      ///< 14      Module Thermal Sensor
+  SPD4_EXTENDED_MODULE_TYPE_STRUCT          ExtendedModuleType;       ///< 15      Extended Module Type
+  UINT8                                     Reserved0;                ///< 16      Reserved
+  SPD4_TIMEBASE_STRUCT                      Timebase;                 ///< 17      Timebases
+  SPD4_TCK_MIN_MTB_STRUCT                   tCKmin;                   ///< 18      SDRAM Minimum Cycle Time (tCKmin)
+  SPD4_TCK_MAX_MTB_STRUCT                   tCKmax;                   ///< 19      SDRAM Maximum Cycle Time (tCKmax)
+  SPD4_CAS_LATENCIES_SUPPORTED_STRUCT       CasLatencies;             ///< 20-23   CAS Latencies Supported
+  SPD4_TAA_MIN_MTB_STRUCT                   tAAmin;                   ///< 24      Minimum CAS Latency Time (tAAmin)
+  SPD4_TRCD_MIN_MTB_STRUCT                  tRCDmin;                  ///< 25      Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD4_TRP_MIN_MTB_STRUCT                   tRPmin;                   ///< 26      Minimum Row Precharge Delay Time (tRPmin)
+  SPD4_TRAS_TRC_MIN_MTB_STRUCT              tRASMintRCMinUpper;       ///< 27      Upper Nibbles for tRAS and tRC
+  SPD4_TRAS_MIN_MTB_STRUCT                  tRASmin;                  ///< 28      Minimum Active to Precharge Delay Time (tRASmin), Least Significant Byte
+  SPD4_TRC_MIN_MTB_STRUCT                   tRCmin;                   ///< 29      Minimum Active to Active/Refresh Delay Time (tRCmin), Least Significant Byte
+  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC1min;                 ///< 30-31   Minimum Refresh Recovery Delay Time (tRFC1min)
+  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC2min;                 ///< 32-33   Minimum Refresh Recovery Delay Time (tRFC2min)
+  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC4min;                 ///< 34-35   Minimum Refresh Recovery Delay Time (tRFC4min)
+  SPD4_TFAW_MIN_MTB_UPPER_STRUCT            tFAWMinUpper;             ///< 36      Upper Nibble for tFAW
+  SPD4_TFAW_MIN_MTB_STRUCT                  tFAWmin;                  ///< 37      Minimum Four Activate Window Delay Time (tFAWmin)
+  SPD4_TRRD_MIN_MTB_STRUCT                  tRRD_Smin;                ///< 38      Minimum Activate to Activate Delay Time (tRRD_Smin), different bank group
+  SPD4_TRRD_MIN_MTB_STRUCT                  tRRD_Lmin;                ///< 39      Minimum Activate to Activate Delay Time (tRRD_Lmin), same bank group
+  SPD4_TCCD_MIN_MTB_STRUCT                  tCCD_Lmin;                ///< 40      Minimum CAS to CAS Delay Time (tCCD_Lmin), Same Bank Group
+  SPD4_TWR_UPPER_NIBBLE_STRUCT              tWRUpperNibble;           ///< 41      Upper Nibble for tWRmin
+  SPD4_TWR_MIN_MTB_STRUCT                   tWRmin;                   ///< 42      Minimum Write Recovery Time (tWRmin)
+  SPD4_TWTR_UPPER_NIBBLE_STRUCT             tWTRUpperNibble;          ///< 43      Upper Nibbles for tWTRmin
+  SPD4_TWTR_MIN_MTB_STRUCT                  tWTR_Smin;                ///< 44      Minimum Write to Read Time (tWTR_Smin), Different Bank Group
+  SPD4_TWTR_MIN_MTB_STRUCT                  tWTR_Lmin;                ///< 45      Minimum Write to Read Time (tWTR_Lmin), Same Bank Group
+  UINT8                                     Reserved1[59 - 46 + 1];   ///< 46-59   Reserved
+  SPD4_CONNECTOR_BIT_MAPPING_BYTE_STRUCT    BitMapping[77 - 60 + 1];  ///< 60-77   Connector to SDRAM Bit Mapping
+  UINT8                                     Reserved2[116 - 78 + 1];  ///< 78-116  Reserved
+  SPD4_TCCD_MIN_FTB_STRUCT                  tCCD_LminFine;            ///< 117     Fine Offset for Minimum CAS to CAS Delay Time (tCCD_Lmin), same bank group
+  SPD4_TRRD_MIN_FTB_STRUCT                  tRRD_LminFine;            ///< 118     Fine Offset for Minimum Activate to Activate Delay Time (tRRD_Lmin), different bank group
+  SPD4_TRRD_MIN_FTB_STRUCT                  tRRD_SminFine;            ///< 119     Fine Offset for Minimum Activate to Activate Delay Time (tRRD_Smin), same bank group
+  SPD4_TRC_MIN_FTB_STRUCT                   tRCminFine;               ///< 120     Fine Offset for Minimum Active to Active/Refresh Delay Time (tRCmin)
+  SPD4_TRP_MIN_FTB_STRUCT                   tRPminFine;               ///< 121     Fine Offset for Minimum Row Precharge Delay Time (tRPabmin)
+  SPD4_TRCD_MIN_FTB_STRUCT                  tRCDminFine;              ///< 122     Fine Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD4_TAA_MIN_FTB_STRUCT                   tAAminFine;               ///< 123     Fine Offset for Minimum CAS Latency Time (tAAmin)
+  SPD4_TCK_MAX_FTB_STRUCT                   tCKmaxFine;               ///< 124     Fine Offset for SDRAM Minimum Cycle Time (tCKmax)
+  SPD4_TCK_MIN_FTB_STRUCT                   tCKminFine;               ///< 125     Fine Offset for SDRAM Maximum Cycle Time (tCKmin)
+  SPD4_CYCLIC_REDUNDANCY_CODE               Crc;                      ///< 126-127 Cyclical Redundancy Code (CRC)
+} SPD4_BASE_SECTION;
+
+typedef struct {
+  SPD4_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;      ///< 128     Module Nominal Height
+  SPD4_UNBUF_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
+  SPD4_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;     ///< 130     Reference Raw Card Used
+  SPD4_UNBUF_ADDRESS_MAPPING           AddressMappingEdgeConn;   ///< 131     Address Mapping from Edge Connector to DRAM
+  UINT8                                Reserved[253 - 132 + 1];  ///< 132-253 Reserved
+  SPD4_CYCLIC_REDUNDANCY_CODE          Crc;                      ///< 254-255 Cyclical Redundancy Code (CRC)
+} SPD4_MODULE_UNBUFFERED;
+
+typedef struct {
+  SPD4_RDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;      ///< 128     Module Nominal Height
+  SPD4_RDIMM_MODULE_NOMINAL_THICKNESS  ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
+  SPD4_RDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;     ///< 130     Reference Raw Card Used
+  SPD4_RDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;     ///< 131     DIMM Module Attributes
+  SPD4_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION                             DimmThermalHeatSpreaderSolution;     ///< 132     RDIMM Thermal Heat Spreader Solution
+  SPD4_MANUFACTURER_ID_CODE                                             RegisterManufacturerIdCode;          ///< 133-134 Register Manufacturer ID Code
+  SPD4_RDIMM_REGISTER_REVISION_NUMBER                                   RegisterRevisionNumber;              ///< 135     Register Revision Number
+  SPD4_RDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM                      AddressMappingFromRegisterToDRAM;    ///< 136     Address Mapping from Register to DRAM
+  SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COMMAND_ADDRESS RegisterOutputDriveStrengthForControlCommandAddress; ///< 137 Register Output Drive Strength for Control and Command Address
+  SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK                   RegisterOutputDriveStrengthForClock; ///< 138     Register Output Drive Strength for Clock
+  UINT8                                                                 Reserved[253 - 139 + 1];             ///< 253-139 Reserved
+  SPD4_CYCLIC_REDUNDANCY_CODE                                           Crc;                                 ///< 254-255 Cyclical Redundancy Code (CRC)
+} SPD4_MODULE_REGISTERED;
+
+typedef struct {
+  SPD4_LRDIMM_MODULE_NOMINAL_HEIGHT           ModuleNominalHeight;         ///< 128     Module Nominal Height
+  SPD4_LRDIMM_MODULE_NOMINAL_THICKNESS        ModuleMaximumThickness;      ///< 129     Module Maximum Thickness
+  SPD4_LRDIMM_REFERENCE_RAW_CARD              ReferenceRawCardUsed;        ///< 130     Reference Raw Card Used
+  SPD4_LRDIMM_MODULE_ATTRIBUTES               DimmModuleAttributes;        ///< 131     DIMM Module Attributes
+  SPD4_LRDIMM_THERMAL_HEAT_SPREADER_SOLUTION  ThermalHeatSpreaderSolution; ///< 132     RDIMM Thermal Heat Spreader Solution
+  SPD4_MANUFACTURER_ID_CODE                   RegisterManufacturerIdCode;  ///< 133-134 Register Manufacturer ID Code
+  SPD4_LRDIMM_REGISTER_REVISION_NUMBER        RegisterRevisionNumber;      ///< 135     Register Revision Number
+  SPD4_LRDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM                           AddressMappingFromRegisterToDram;                       ///< 136 Address Mapping from Register to DRAM
+  SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COMMAND_ADDRESS      RegisterOutputDriveStrengthForControlCommandAddress;    ///< 137 Register Output Drive Strength for Control and Command Address
+  SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK                        RegisterOutputDriveStrengthForClock;                    ///< 138 Register Output Drive Strength for Clock
+  SPD4_LRDIMM_DATA_BUFFER_REVISION_NUMBER     DataBufferRevisionNumber;    ///< 139     Data Buffer Revision Number
+  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK    DramVrefDQForPackageRank0;   ///< 140     DRAM VrefDQ for Package Rank 0
+  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK    DramVrefDQForPackageRank1;   ///< 141     DRAM VrefDQ for Package Rank 1
+  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK    DramVrefDQForPackageRank2;   ///< 142     DRAM VrefDQ for Package Rank 2
+  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK    DramVrefDQForPackageRank3;   ///< 143     DRAM VrefDQ for Package Rank 3
+  SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE                   DataBufferVrefDQForDramInterface;               ///< 144     Data Buffer VrefDQ for DRAM Interface
+  SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_RATE        DataBufferMdqDriveStrengthRttForDataRateLe1866; ///< 145     Data Buffer MDQ Drive Strength and RTT for data rate <= 1866
+  SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_RATE        DataBufferMdqDriveStrengthRttForDataRateLe2400; ///< 146     Data Buffer MDQ Drive Strength and RTT for data rate <=2400
+  SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_RATE        DataBufferMdqDriveStrengthRttForDataRateLe3200; ///< 147     Data Buffer MDQ Drive Strength and RTT for data rate <=3200
+  SPD4_LRDIMM_DRAM_DRIVE_STRENGTH                                     DramDriveStrength;                              ///< 148     DRAM Drive Strength
+  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE                   DramOdtRttWrRttNomForDataRateLe1866;            ///< 149     DRAM ODT (RTT_WR and RTT_NOM) for data rate <= 1866
+  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE                   DramOdtRttWrRttNomForDataRateLe2400;            ///< 150     DRAM ODT (RTT_WR and RTT_NOM) for data rate <= 2400
+  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE                   DramOdtRttWrRttNomForDataRateLe3200;            ///< 151     DRAM ODT (RTT_WR and RTT_NOM) for data rate <= 3200
+  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE                         DramOdtRttParkForDataRateLe1866;                ///< 152     DRAM ODT (RTT_PARK) for data rate <= 1866
+  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE                         DramOdtRttParkForDataRateLe2400;                ///< 153     DRAM ODT (RTT_PARK) for data rate <= 2400
+  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE                         DramOdtRttParkForDataRateLe3200;                ///< 154     DRAM ODT (RTT_PARK) for data rate <= 3200
+  SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE_RANGE             DataBufferVrefDQForDramInterfaceRange;          ///< 155     Data Buffer VrefDQ for DRAM Interface Range
+  SPD4_LRDIMM_DATA_BUFFER_DQ_DECISION_FEEDBACK_EQUALIZATION           DataBufferDqDecisionFeedbackEqualization;       ///< 156     Data Buffer DQ Decision Feedback Equalization
+  UINT8                                                               Reserved[253 - 157 + 1];                        ///< 253-132 Reserved
+  SPD4_CYCLIC_REDUNDANCY_CODE                                         Crc;                                            ///< 254-255 Cyclical Redundancy Code (CRC)
+} SPD4_MODULE_LOADREDUCED;
+
+typedef struct {
+  UINT8                                                      Reserved0[191 - 128 + 1];              ///< 128-191  Reserved
+  SPD4_NVDIMM_MODULE_PRODUCT_IDENTIFIER                      ModuleProductIdentifier;               ///< 192-193  Module Product Identifier
+  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_MANUFACTURER_ID_CODE      SubsystemControllerManufacturerIdCode; ///< 194-195  Subsystem Controller Manufacturer's ID Code
+  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_IDENTIFIER                SubsystemControllerIdentifier;         ///< 196-197  Subsystem Controller Identifier
+  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_REVISION_CODE             SubsystemControllerRevisionCode;       ///< 198      Subsystem Controller Revision Code
+  SPD4_NVDIMM_REFERENCE_RAW_CARD                             ReferenceRawCardUsed;                  ///< 199      Reference Raw Card Used
+  SPD4_NVDIMM_MODULE_CHARACTERISTICS                         ModuleCharacteristics;                 ///< 200      Module Characteristics
+  SPD4_NVDIMM_HYBRID_MODULE_MEDIA_TYPES                      HybridModuleMediaTypes;                ///< 201-202  Hybrid Module Media Types
+  SPD4_NVDIMM_MAXIMUM_NONVOLATILE_MEMORY_INITIALIZATION_TIME MaximumNonVolatileMemoryInitializationTime; ///< 203 Maximum Non-Volatile Memory Initialization Time
+  SPD4_NVDIMM_FUNCTION_INTERFACE_DESCRIPTOR                  FunctionInterfaceDescriptors[8];       ///< 204-219  Function Interface Descriptors
+  UINT8                                                      Reserved[253 - 220 + 1];               ///< 220-253  Reserved
+  SPD4_CYCLIC_REDUNDANCY_CODE                                Crc;                                   ///< 254-255  Cyclical Redundancy Code (CRC)
+} SPD4_MODULE_NVDIMM;
+
+typedef union {
+  SPD4_MODULE_UNBUFFERED              Unbuffered;               ///< 128-255 Unbuffered Memory Module Types
+  SPD4_MODULE_REGISTERED              Registered;               ///< 128-255 Registered Memory Module Types
+  SPD4_MODULE_LOADREDUCED             LoadReduced;              ///< 128-255 Load Reduced Memory Module Types
+  SPD4_MODULE_NVDIMM                  NonVolatile;              ///< 128-255 Non-Volatile (NVDIMM-N) Hybrid Memory Parameters
+} SPD4_MODULE_SPECIFIC;
+
+typedef struct {
+  UINT8                               ModulePartNumber[348 - 329 + 1]; ///< 329-348 Module Part Number
+} SPD4_MODULE_PART_NUMBER;
+
+typedef struct {
+  UINT8                               ManufacturerSpecificData[381 - 353 + 1]; ///< 353-381 Manufacturer's Specific Data
+} SPD4_MANUFACTURER_SPECIFIC;
+
+typedef UINT8                         SPD4_MODULE_REVISION_CODE;///< 349     Module Revision Code
+typedef UINT8                         SPD4_DRAM_STEPPING;       ///< 352     Dram Stepping
+
+typedef struct {
+  SPD4_UNIQUE_MODULE_ID               ModuleId;                 ///< 320-328 Unique Module ID
+  SPD4_MODULE_PART_NUMBER             ModulePartNumber;         ///< 329-348 Module Part Number
+  SPD4_MODULE_REVISION_CODE           ModuleRevisionCode;       ///< 349     Module Revision Code
+  SPD4_MANUFACTURER_ID_CODE           DramIdCode;               ///< 350-351 Dram Manufacturer ID Code
+  SPD4_DRAM_STEPPING                  DramStepping;             ///< 352     Dram Stepping
+  SPD4_MANUFACTURER_SPECIFIC          ManufacturerSpecificData; ///< 353-381 Manufacturer's Specific Data
+  UINT8                               Reserved[2];              ///< 382-383 Reserved
+} SPD4_MANUFACTURING_DATA;
+
+typedef struct {
+  UINT8                               Reserved[511 - 384 + 1];  ///< 384-511 Unbuffered Memory Module Types
+} SPD4_END_USER_SECTION;
+
+///
+/// DDR4 Serial Presence Detect structure
+///
+typedef struct {
+  SPD4_BASE_SECTION                   Base;                     ///< 0-127   Base Configuration and DRAM Parameters
+  SPD4_MODULE_SPECIFIC                Module;                   ///< 128-255 Module-Specific Section
+  UINT8                               Reserved[319 - 256 + 1];  ///< 256-319 Reserved
+  SPD4_MANUFACTURING_DATA             ManufactureInfo;          ///< 320-383 Manufacturing Information
+  SPD4_END_USER_SECTION               EndUser;                  ///< 384-511 End User Programmable
+} SPD_DDR4;
+
+#pragma pack (pop)
+#endif
diff --git a/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h b/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
new file mode 100644
index 0000000..46ee68b
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
@@ -0,0 +1,474 @@
+/** @file
+  This file contains definitions for SPD LPDDR.
+
+  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  @par Revision Reference:
+    - Serial Presence Detect (SPD) for LPDDR3 and LPDDR4 SDRAM Modules Document Release 2
+      http://www.jedec.org/standards-documents/docs/spd412m-2
+**/
+
+#ifndef _SDRAM_SPD_LPDDR_H_
+#define _SDRAM_SPD_LPDDR_H_
+
+#pragma pack (push, 1)
+
+typedef union {
+  struct {
+    UINT8  BytesUsed                           :  4; ///< Bits 3:0
+    UINT8  BytesTotal                          :  3; ///< Bits 6:4
+    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_DEVICE_DESCRIPTION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Minor                               :  4; ///< Bits 3:0
+    UINT8  Major                               :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_REVISION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Type                                :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_DRAM_DEVICE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ModuleType                          :  4; ///< Bits 3:0
+    UINT8  HybridMedia                         :  3; ///< Bits 6:4
+    UINT8  Hybrid                              :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Density                             :  4; ///< Bits 3:0
+    UINT8  BankAddress                         :  2; ///< Bits 5:4
+    UINT8  BankGroup                           :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SDRAM_DENSITY_BANKS_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
+    UINT8  RowAddress                          :  3; ///< Bits 5:3
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SDRAM_ADDRESSING_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SignalLoading                       :  2; ///< Bits 1:0
+    UINT8  ChannelsPerDie                      :  2; ///< Bits 3:2
+    UINT8  DieCount                            :  3; ///< Bits 6:4
+    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SDRAM_PACKAGE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
+    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SDRAM_OPTIONAL_FEATURES_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SDRAM_THERMAL_REFRESH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  5; ///< Bits 4:0
+    UINT8  SoftPPR                             :  1; ///< Bits 5:5
+    UINT8  PostPackageRepair                   :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  OperationAt1_20                     :  1; ///< Bits 0:0
+    UINT8  EndurantAt1_20                      :  1; ///< Bits 1:1
+    UINT8  OperationAt1_10                     :  1; ///< Bits 2:2
+    UINT8  EndurantAt1_10                      :  1; ///< Bits 3:3
+    UINT8  OperationAtTBD2V                    :  1; ///< Bits 4:4
+    UINT8  EndurantAtTBD2V                     :  1; ///< Bits 5:5
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_NOMINAL_VOLTAGE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
+    UINT8  RankCount                           :  3; ///< Bits 5:3
+    UINT8  Reserved                            :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_ORGANIZATION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
+    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
+    UINT8  NumberofChannels                    :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_MEMORY_BUS_WIDTH_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Reserved                            :  7; ///< Bits 6:0
+    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_THERMAL_SENSOR_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ExtendedBaseModuleType              :  4; ///< Bits 3:0
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_EXTENDED_MODULE_TYPE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ChipSelectLoading                   :  3; ///< Bits 2:0
+    UINT8  CommandAddressControlClockLoading   :  3; ///< Bits 5:3
+    UINT8  DataStrobeMaskLoading               :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_SIGNAL_LOADING_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  Fine                                :  2; ///< Bits 1:0
+    UINT8  Medium                              :  2; ///< Bits 3:2
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TIMEBASE_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tCKmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TCK_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tCKmax                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TCK_MAX_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT32 Cl3                                 :  1;  ///< Bits 0:0
+    UINT32 Cl6                                 :  1;  ///< Bits 1:1
+    UINT32 Cl8                                 :  1;  ///< Bits 2:2
+    UINT32 Cl9                                 :  1;  ///< Bits 3:3
+    UINT32 Cl10                                :  1;  ///< Bits 4:4
+    UINT32 Cl11                                :  1;  ///< Bits 5:5
+    UINT32 Cl12                                :  1;  ///< Bits 6:6
+    UINT32 Cl14                                :  1;  ///< Bits 7:7
+    UINT32 Cl16                                :  1;  ///< Bits 8:8
+    UINT32 Reserved0                           :  1;  ///< Bits 9:9
+    UINT32 Cl20                                :  1;  ///< Bits 10:10
+    UINT32 Cl22                                :  1;  ///< Bits 11:11
+    UINT32 Cl24                                :  1;  ///< Bits 12:12
+    UINT32 Reserved1                           :  1;  ///< Bits 13:13
+    UINT32 Cl28                                :  1;  ///< Bits 14:14
+    UINT32 Reserved2                           :  1;  ///< Bits 15:15
+    UINT32 Cl32                                :  1;  ///< Bits 16:16
+    UINT32 Reserved3                           :  1;  ///< Bits 17:17
+    UINT32 Cl36                                :  1;  ///< Bits 18:18
+    UINT32 Reserved4                           :  1;  ///< Bits 19:19
+    UINT32 Cl40                                :  1;  ///< Bits 20:20
+    UINT32 Reserved5                           :  11; ///< Bits 31:21
+  } Bits;
+  UINT32 Data;
+  UINT16 Data16[2];
+  UINT8  Data8[4];
+} SPD_LPDDR_CAS_LATENCIES_SUPPORTED_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tAAmin                              :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TAA_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  ReadLatencyMode                     :  2; ///< Bits 1:0
+    UINT8  WriteLatencySet                     :  2; ///< Bits 3:2
+    UINT8  Reserved                            :  4; ///< Bits 7:4
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_RW_LATENCY_OPTION_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRCDmin                             :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TRCD_MIN_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRPab                               :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TRP_AB_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  tRPpb                               :  8; ///< Bits 7:0
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_TRP_PB_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT16  tRFCab                             :  16; ///< Bits 15:0
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD_LPDDR_TRFC_AB_MTB_STRUCT;
+
+typedef union {
+struct {
+    UINT16  tRFCpb                             :  16; ///< Bits 15:0
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD_LPDDR_TRFC_PB_MTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT8  BitOrderatSDRAM                     :  5; ///< Bits 4:0
+    UINT8  WiredtoUpperLowerNibble             :  1; ///< Bits 5:5
+    UINT8  PackageRankMap                      :  2; ///< Bits 7:6
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_CONNECTOR_BIT_MAPPING_BYTE_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRPpbFine                            :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TRP_PB_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRPabFine                            :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TRP_AB_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tRCDminFine                          :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TRCD_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tAAminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TAA_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCKmaxFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TCK_MAX_FTB_STRUCT;
+
+typedef union {
+  struct {
+    INT8  tCKminFine                           :  8; ///< Bits 7:0
+  } Bits;
+  INT8  Data;
+} SPD_LPDDR_TCK_MIN_FTB_STRUCT;
+
+typedef union {
+  struct {
+    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
+    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
+    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
+  } Bits;
+  UINT16 Data;
+  UINT8  Data8[2];
+} SPD_LPDDR_MANUFACTURER_ID_CODE;
+
+typedef struct {
+  UINT8 Location;                              ///< Module Manufacturing Location
+} SPD_LPDDR_MANUFACTURING_LOCATION;
+
+typedef struct {
+  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
+  UINT8  Week;                                 ///< Year represented in BCD (47h = week 47)
+} SPD_LPDDR_MANUFACTURING_DATE;
+
+typedef union {
+  UINT32 Data;
+  UINT16 SerialNumber16[2];
+  UINT8  SerialNumber8[4];
+} SPD_LPDDR_MANUFACTURER_SERIAL_NUMBER;
+
+typedef struct {
+  SPD_LPDDR_MANUFACTURER_ID_CODE            IdCode;                   ///< Module Manufacturer ID Code
+  SPD_LPDDR_MANUFACTURING_LOCATION          Location;                 ///< Module Manufacturing Location
+  SPD_LPDDR_MANUFACTURING_DATE              Date;                     ///< Module Manufacturing Year, in BCD (range: 2000-2255)
+  SPD_LPDDR_MANUFACTURER_SERIAL_NUMBER      SerialNumber;             ///< Module Serial Number
+} SPD_LPDDR_UNIQUE_MODULE_ID;
+
+typedef union {
+  struct {
+    UINT8  FrontThickness                      :  4; ///< Bits 3:0
+    UINT8  BackThickness                       :  4; ///< Bits 7:4
+  } Bits;
+  UINT8 Data;
+} SPD_LPDDR_MODULE_MAXIMUM_THICKNESS;
+
+typedef union {
+  struct {
+    UINT8  Height                              :  5; ///< Bits 4:0
+    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_MODULE_NOMINAL_HEIGHT;
+
+typedef union {
+  struct {
+    UINT8  Card                                :  5; ///< Bits 4:0
+    UINT8  Revision                            :  2; ///< Bits 6:5
+    UINT8  Extension                           :  1; ///< Bits 7:7
+  } Bits;
+  UINT8  Data;
+} SPD_LPDDR_REFERENCE_RAW_CARD;
+
+typedef union {
+  UINT16 Crc[1];
+  UINT8  Data8[2];
+} SPD_LPDDR_CYCLIC_REDUNDANCY_CODE;
+
+typedef struct {
+  SPD_LPDDR_DEVICE_DESCRIPTION_STRUCT            Description;              ///< 0       Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
+  SPD_LPDDR_REVISION_STRUCT                      Revision;                 ///< 1       SPD Revision
+  SPD_LPDDR_DRAM_DEVICE_TYPE_STRUCT              DramDeviceType;           ///< 2       DRAM Device Type
+  SPD_LPDDR_MODULE_TYPE_STRUCT                   ModuleType;               ///< 3       Module Type
+  SPD_LPDDR_SDRAM_DENSITY_BANKS_STRUCT           SdramDensityAndBanks;     ///< 4       SDRAM Density and Banks
+  SPD_LPDDR_SDRAM_ADDRESSING_STRUCT              SdramAddressing;          ///< 5       SDRAM Addressing
+  SPD_LPDDR_SDRAM_PACKAGE_TYPE_STRUCT            SdramPackageType;         ///< 6       SDRAM Package Type
+  SPD_LPDDR_SDRAM_OPTIONAL_FEATURES_STRUCT       SdramOptionalFeatures;    ///< 7       SDRAM Optional Features
+  SPD_LPDDR_SDRAM_THERMAL_REFRESH_STRUCT         ThermalAndRefreshOptions; ///< 8       SDRAM Thermal and Refresh Options
+  SPD_LPDDR_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT OtherOptionalFeatures;    ///< 9      Other SDRAM Optional Features
+  UINT8                                          Reserved0;                ///< 10      Reserved
+  SPD_LPDDR_MODULE_NOMINAL_VOLTAGE_STRUCT        ModuleNominalVoltage;     ///< 11      Module Nominal Voltage, VDD
+  SPD_LPDDR_MODULE_ORGANIZATION_STRUCT           ModuleOrganization;       ///< 12      Module Organization
+  SPD_LPDDR_MODULE_MEMORY_BUS_WIDTH_STRUCT       ModuleMemoryBusWidth;     ///< 13      Module Memory Bus Width
+  SPD_LPDDR_MODULE_THERMAL_SENSOR_STRUCT         ModuleThermalSensor;      ///< 14      Module Thermal Sensor
+  SPD_LPDDR_EXTENDED_MODULE_TYPE_STRUCT          ExtendedModuleType;       ///< 15      Extended Module Type
+  SPD_LPDDR_SIGNAL_LOADING_STRUCT                SignalLoading;            ///< 16      Signal Loading
+  SPD_LPDDR_TIMEBASE_STRUCT                      Timebase;                 ///< 17      Timebases
+  SPD_LPDDR_TCK_MIN_MTB_STRUCT                   tCKmin;                   ///< 18      SDRAM Minimum Cycle Time (tCKmin)
+  SPD_LPDDR_TCK_MAX_MTB_STRUCT                   tCKmax;                   ///< 19      SDRAM Maximum Cycle Time (tCKmax)
+  SPD_LPDDR_CAS_LATENCIES_SUPPORTED_STRUCT       CasLatencies;             ///< 20-23   CAS Latencies Supported
+  SPD_LPDDR_TAA_MIN_MTB_STRUCT                   tAAmin;                   ///< 24      Minimum CAS Latency Time (tAAmin)
+  SPD_LPDDR_RW_LATENCY_OPTION_STRUCT             LatencySetOptions;        ///< 25      Read and Write Latency Set Options
+  SPD_LPDDR_TRCD_MIN_MTB_STRUCT                  tRCDmin;                  ///< 26      Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD_LPDDR_TRP_AB_MTB_STRUCT                    tRPab;                    ///< 27      Minimum Row Precharge Delay Time (tRPab), all banks
+  SPD_LPDDR_TRP_PB_MTB_STRUCT                    tRPpb;                    ///< 28      Minimum Row Precharge Delay Time (tRPpb), per bank
+  SPD_LPDDR_TRFC_AB_MTB_STRUCT                   tRFCab;                   ///< 29-30   Minimum Refresh Recovery Delay Time (tRFCab), all banks
+  SPD_LPDDR_TRFC_PB_MTB_STRUCT                   tRFCpb;                   ///< 31-32   Minimum Refresh Recovery Delay Time (tRFCpb), per bank
+  UINT8                                          Reserved1[59 - 33 + 1];   ///< 33-59   Reserved
+  SPD_LPDDR_CONNECTOR_BIT_MAPPING_BYTE_STRUCT    BitMapping[77 - 60 + 1];  ///< 60-77   Connector to SDRAM Bit Mapping
+  UINT8                                          Reserved2[119 - 78 + 1];  ///< 78-119  Reserved
+  SPD_LPDDR_TRP_PB_FTB_STRUCT                    tRPpbFine;                ///< 120     Fine Offset for Minimum Row Precharge Delay Time (tRPpbFine), per bank
+  SPD_LPDDR_TRP_AB_FTB_STRUCT                    tRPabFine;                ///< 121     Fine Offset for Minimum Row Precharge Delay Time (tRPabFine), all ranks
+  SPD_LPDDR_TRCD_MIN_FTB_STRUCT                  tRCDminFine;              ///< 122     Fine Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
+  SPD_LPDDR_TAA_MIN_FTB_STRUCT                   tAAminFine;               ///< 123     Fine Offset for Minimum CAS Latency Time (tAAmin)
+  SPD_LPDDR_TCK_MAX_FTB_STRUCT                   tCKmaxFine;               ///< 124     Fine Offset for SDRAM Maximum Cycle Time (tCKmax)
+  SPD_LPDDR_TCK_MIN_FTB_STRUCT                   tCKminFine;               ///< 125     Fine Offset for SDRAM Minimum Cycle Time (tCKmin)
+  SPD_LPDDR_CYCLIC_REDUNDANCY_CODE               Crc;                      ///< 126-127 Cyclical Redundancy Code (CRC)
+} SPD_LPDDR_BASE_SECTION;
+
+typedef struct {
+  SPD_LPDDR_MODULE_NOMINAL_HEIGHT         ModuleNominalHeight;      ///< 128     Module Nominal Height
+  SPD_LPDDR_MODULE_MAXIMUM_THICKNESS      ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
+  SPD_LPDDR_REFERENCE_RAW_CARD            ReferenceRawCardUsed;     ///< 130     Reference Raw Card Used
+  UINT8                                   Reserved[253 - 131 + 1];  ///< 131-253 Reserved
+  SPD_LPDDR_CYCLIC_REDUNDANCY_CODE        Crc;                      ///< 254-255 Cyclical Redundancy Code (CRC)
+} SPD_LPDDR_MODULE_LPDIMM;
+
+typedef struct {
+  SPD_LPDDR_MODULE_LPDIMM                 LpDimm;                   ///< 128-255 Unbuffered Memory Module Types
+} SPD_LPDDR_MODULE_SPECIFIC;
+
+typedef struct {
+  UINT8                                   ModulePartNumber[348 - 329 + 1]; ///< 329-348 Module Part Number
+} SPD_LPDDR_MODULE_PART_NUMBER;
+
+typedef struct {
+  UINT8                                   ManufacturerSpecificData[381 - 353 + 1]; ///< 353-381 Manufacturer's Specific Data
+} SPD_LPDDR_MANUFACTURER_SPECIFIC;
+
+typedef UINT8                             SPD_LPDDR_MODULE_REVISION_CODE;///< 349     Module Revision Code
+typedef UINT8                             SPD_LPDDR_DRAM_STEPPING;       ///< 352     Dram Stepping
+
+typedef struct {
+  SPD_LPDDR_UNIQUE_MODULE_ID              ModuleId;                 ///< 320-328 Unique Module ID
+  SPD_LPDDR_MODULE_PART_NUMBER            ModulePartNumber;         ///< 329-348 Module Part Number
+  SPD_LPDDR_MODULE_REVISION_CODE          ModuleRevisionCode;       ///< 349     Module Revision Code
+  SPD_LPDDR_MANUFACTURER_ID_CODE          DramIdCode;               ///< 350-351 Dram Manufacturer ID Code
+  SPD_LPDDR_DRAM_STEPPING                 DramStepping;             ///< 352     Dram Stepping
+  SPD_LPDDR_MANUFACTURER_SPECIFIC         ManufacturerSpecificData; ///< 353-381 Manufacturer's Specific Data
+  UINT8                                   Reserved[383 - 382 + 1];  ///< 382-383 Reserved
+} SPD_LPDDR_MANUFACTURING_DATA;
+
+typedef struct {
+  UINT8                                   Reserved[511 - 384 + 1];  ///< 384-511 End User Programmable
+} SPD_LPDDR_END_USER_SECTION;
+
+///
+/// LPDDR Serial Presence Detect structure
+///
+typedef struct {
+  SPD_LPDDR_BASE_SECTION                  Base;                     ///< 0-127   Base Configuration and DRAM Parameters
+  SPD_LPDDR_MODULE_SPECIFIC               Module;                   ///< 128-255 Module-Specific Section
+  UINT8                                   Reserved[319 - 256 + 1];  ///< 256-319 Hybrid Memory Parameters
+  SPD_LPDDR_MANUFACTURING_DATA            ManufactureInfo;          ///< 320-383 Manufacturing Information
+  SPD_LPDDR_END_USER_SECTION              EndUser;                  ///< 384-511 End User Programmable
+} SPD_LPDDR;
+
+#pragma pack (pop)
+#endif
-- 
2.8.0.windows.1



^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH v3] MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec
  2016-11-23  7:03 [PATCH v3] MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec Liming Gao
@ 2016-11-23 16:18 ` Mudusuru, Giri P
  0 siblings, 0 replies; 2+ messages in thread
From: Mudusuru, Giri P @ 2016-11-23 16:18 UTC (permalink / raw)
  To: Gao, Liming, edk2-devel@lists.01.org

Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com> 

> -----Original Message-----
> From: Gao, Liming
> Sent: Tuesday, November 22, 2016 11:03 PM
> To: edk2-devel@lists.01.org
> Cc: Mudusuru, Giri P <giri.p.mudusuru@intel.com>
> Subject: [PATCH v3] MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR
> definition per SPD spec
> 
> https://bugzilla.tianocore.org/show_bug.cgi?id=201
> 
> In V3, Use Odt to replace ODT, Cke to replace CKE, Id to replace ID,
> and Cl to replace CL in structure field name.
> 
> In V2, separate DDR3, DDR4 and LPDDR definition into the different files;
> use the different SPD prefix as structure definitions for each SPD type.
> 
> Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Liming Gao <liming.gao@intel.com>
> ---
>  MdePkg/Include/IndustryStandard/SdramSpd.h      |  31 +-
>  MdePkg/Include/IndustryStandard/SdramSpdDdr3.h  | 769
> +++++++++++++++++++
>  MdePkg/Include/IndustryStandard/SdramSpdDdr4.h  | 958
> ++++++++++++++++++++++++
>  MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h | 474 ++++++++++++
>  4 files changed, 2221 insertions(+), 11 deletions(-)
>  create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
>  create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
>  create mode 100644 MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
> 
> diff --git a/MdePkg/Include/IndustryStandard/SdramSpd.h
> b/MdePkg/Include/IndustryStandard/SdramSpd.h
> index 2b2012b..68f9045 100644
> --- a/MdePkg/Include/IndustryStandard/SdramSpd.h
> +++ b/MdePkg/Include/IndustryStandard/SdramSpd.h
> @@ -1,19 +1,23 @@
>  /** @file
>    This file contains definitions for the SPD fields on an SDRAM.
> -
> -  Copyright (c) 2007 - 2008, Intel Corporation. All rights reserved.<BR>
> -  This program and the accompanying materials
> -  are licensed and made available under the terms and conditions of the BSD
> License
> -  which accompanies this distribution.  The full text of the license may be
> found at
> -  http://opensource.org/licenses/bsd-license.php
> 
> -  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> -  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +  Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
> +  This program and the accompanying materials
> +  are licensed and made available under the terms and conditions of the BSD
> License
> +  which accompanies this distribution.  The full text of the license may be
> found at
> +  http://opensource.org/licenses/bsd-license.php
> +
> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> +  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
>  **/
> 
>  #ifndef _SDRAM_SPD_H_
>  #define _SDRAM_SPD_H_
> 
> +#include <IndustryStandard/SdramSpdDdr3.h>
> +#include <IndustryStandard/SdramSpdDdr4.h>
> +#include <IndustryStandard/SdramSpdLpDdr.h>
> +
>  //
>  // SDRAM SPD field definitions
>  //
> @@ -47,9 +51,14 @@
>  //
>  // Memory Type Definitions
>  //
> -#define SPD_VAL_SDR_TYPE  4 ///< SDR SDRAM memory
> -#define SPD_VAL_DDR_TYPE  7 ///< DDR SDRAM memory
> -#define SPD_VAL_DDR2_TYPE 8 ///< DDR2 SDRAM memory
> +#define SPD_VAL_SDR_TYPE  4       ///< SDR SDRAM memory
> +#define SPD_VAL_DDR_TYPE  7       ///< DDR SDRAM memory
> +#define SPD_VAL_DDR2_TYPE 8       ///< DDR2 SDRAM memory
> +#define SPD_VAL_DDR3_TYPE 11      ///< DDR3 SDRAM memory
> +#define SPD_VAL_DDR4_TYPE 12      ///< DDR4 SDRAM memory
> +#define SPD_VAL_LPDDR3_TYPE 15    ///< LPDDR3 SDRAM memory
> +#define SPD_VAL_LPDDR4_TYPE 16    ///< LPDDR4 SDRAM memory
> +
>  //
>  // ECC Type Definitions
>  //
> diff --git a/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
> b/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
> new file mode 100644
> index 0000000..e280919
> --- /dev/null
> +++ b/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h
> @@ -0,0 +1,769 @@
> +/** @file
> +  This file contains definitions for SPD DDR3.
> +
> +  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
> +  This program and the accompanying materials
> +  are licensed and made available under the terms and conditions of the BSD
> License
> +  which accompanies this distribution.  The full text of the license may be
> found at
> +  http://opensource.org/licenses/bsd-license.php
> +
> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> +  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +
> +  @par Revision Reference:
> +    - Serial Presence Detect (SPD) for DDR3 SDRAM Modules Document
> Release 6
> +      http://www.jedec.org/sites/default/files/docs/4_01_02_11R21A.pdf
> +**/
> +
> +#ifndef _SDRAM_SPD_DDR3_H_
> +#define _SDRAM_SPD_DDR3_H_
> +
> +#pragma pack (push, 1)
> +
> +typedef union {
> +  struct {
> +    UINT8  BytesUsed                           :  4; ///< Bits 3:0
> +    UINT8  BytesTotal                          :  3; ///< Bits 6:4
> +    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_DEVICE_DESCRIPTION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Minor                               :  4; ///< Bits 3:0
> +    UINT8  Major                               :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_REVISION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Type                                :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_DRAM_DEVICE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ModuleType                          :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MODULE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Density                             :  4; ///< Bits 3:0
> +    UINT8  BankAddress                         :  3; ///< Bits 6:4
> +    UINT8  Reserved                            :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_SDRAM_DENSITY_BANKS_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
> +    UINT8  RowAddress                          :  3; ///< Bits 5:3
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_SDRAM_ADDRESSING_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  OperationAt1_50                     :  1; ///< Bits 0:0
> +    UINT8  OperationAt1_35                     :  1; ///< Bits 1:1
> +    UINT8  OperationAt1_25                     :  1; ///< Bits 2:2
> +    UINT8  Reserved                            :  5; ///< Bits 7:3
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MODULE_NOMINAL_VOLTAGE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
> +    UINT8  RankCount                           :  3; ///< Bits 5:3
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MODULE_ORGANIZATION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
> +    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
> +    UINT8  Reserved                            :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MODULE_MEMORY_BUS_WIDTH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Divisor                             :  4; ///< Bits 3:0
> +    UINT8  Dividend                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_FINE_TIMEBASE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Dividend                            :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MEDIUM_TIMEBASE_DIVIDEND_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Divisor                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MEDIUM_TIMEBASE_DIVISOR_STRUCT;
> +
> +typedef struct {
> +  SPD3_MEDIUM_TIMEBASE_DIVIDEND_STRUCT Dividend; ///< Medium
> Timebase (MTB) Dividend
> +  SPD3_MEDIUM_TIMEBASE_DIVISOR_STRUCT  Divisor;  ///< Medium
> Timebase (MTB) Divisor
> +} SPD3_MEDIUM_TIMEBASE;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCKmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TCK_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT16 Cl4                                 :  1; ///< Bits 0:0
> +    UINT16 Cl5                                 :  1; ///< Bits 1:1
> +    UINT16 Cl6                                 :  1; ///< Bits 2:2
> +    UINT16 Cl7                                 :  1; ///< Bits 3:3
> +    UINT16 Cl8                                 :  1; ///< Bits 4:4
> +    UINT16 Cl9                                 :  1; ///< Bits 5:5
> +    UINT16 Cl10                                :  1; ///< Bits 6:6
> +    UINT16 Cl11                                :  1; ///< Bits 7:7
> +    UINT16 Cl12                                :  1; ///< Bits 8:8
> +    UINT16 Cl13                                :  1; ///< Bits 9:9
> +    UINT16 Cl14                                :  1; ///< Bits 10:10
> +    UINT16 Cl15                                :  1; ///< Bits 11:11
> +    UINT16 Cl16                                :  1; ///< Bits 12:12
> +    UINT16 Cl17                                :  1; ///< Bits 13:13
> +    UINT16 Cl18                                :  1; ///< Bits 14:14
> +    UINT16 Reserved                            :  1; ///< Bits 15:15
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD3_CAS_LATENCIES_SUPPORTED_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tAAmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TAA_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWRmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TWR_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRCDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRCD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRRDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRRD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRPmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRP_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRASminUpper                        :  4; ///< Bits 3:0
> +    UINT8  tRCminUpper                         :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRAS_TRC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRASmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRAS_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRCmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT16 tRFCmin                             :  16; ///< Bits 15:0
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD3_TRFC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWTRmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TWTR_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRTPmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TRTP_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tFAWminUpper                        :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TFAW_MIN_MTB_UPPER_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tFAWmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_TFAW_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Rzq6                                :  1; ///< Bits 0:0
> +    UINT8  Rzq7                                :  1; ///< Bits 1:1
> +    UINT8  Reserved                            :  5; ///< Bits 6:2
> +    UINT8  DllOff                              :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_SDRAM_OPTIONAL_FEATURES_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ExtendedTemperatureRange            :  1; ///< Bits 0:0
> +    UINT8  ExtendedTemperatureRefreshRate      :  1; ///< Bits 1:1
> +    UINT8  AutoSelfRefresh                     :  1; ///< Bits 2:2
> +    UINT8  OnDieThermalSensor                  :  1; ///< Bits 3:3
> +    UINT8  Reserved                            :  3; ///< Bits 6:4
> +    UINT8  PartialArraySelfRefresh             :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_SDRAM_THERMAL_REFRESH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ThermalSensorAccuracy               :  7; ///< Bits 6:0
> +    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MODULE_THERMAL_SENSOR_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SignalLoading                       :  2; ///< Bits 1:0
> +    UINT8  Reserved                            :  2; ///< Bits 3:2
> +    UINT8  DieCount                            :  3; ///< Bits 6:4
> +    UINT8  SdramDeviceType                     :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_SDRAM_DEVICE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCKminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD3_TCK_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tAAminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD3_TAA_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRCDminFine                          :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD3_TRCD_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRPminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD3_TRP_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRCminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD3_TRC_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
> +    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
> +    UINT8  VendorSpecific                      :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_MAXIMUM_ACTIVE_COUNT_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                              :  5; ///< Bits 4:0
> +    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_UNBUF_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                      :  4; ///< Bits 3:0
> +    UINT8  BackThickness                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_UNBUF_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_UNBUF_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  MappingRank1                        :  1; ///< Bits 0:0
> +    UINT8  Reserved                            :  7; ///< Bits 7:1
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_UNBUF_ADDRESS_MAPPING;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                              :  5; ///< Bits 4:0
> +    UINT8  Reserved                            :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                      :  4; ///< Bits 3:0
> +    UINT8  BackThickness                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterCount                       :  2; ///< Bits 1:0
> +    UINT8  DramRowCount                        :  2; ///< Bits 3:2
> +    UINT8  RegisterType                        :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_MODULE_ATTRIBUTES;
> +
> +typedef union {
> +  struct {
> +    UINT8  HeatSpreaderThermalCharacteristics  :  7; ///< Bits 6:0
> +    UINT8  HeatSpreaderSolution                :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
> +
> +typedef union {
> +  struct {
> +    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
> +    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
> +    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD3_MANUFACTURER_ID_CODE;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterRevisionNumber;             ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REGISTER_REVISION_NUMBER;
> +
> +typedef union {
> +  struct {
> +    UINT8 Bit0                                :  1; ///< Bits 0:0
> +    UINT8 Bit1                                :  1; ///< Bits 1:1
> +    UINT8 Bit2                                :  1; ///< Bits 2:2
> +    UINT8 Reserved                            :  5; ///< Bits 7:3
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REGISTER_TYPE;
> +
> +typedef union {
> +  struct {
> +    UINT8 Reserved                            :  4; ///< Bits 0:3
> +    UINT8 CommandAddressAOutputs              :  2; ///< Bits 5:4
> +    UINT8 CommandAddressBOutputs              :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REGISTER_CONTROL_COMMAND_ADDRESS;
> +
> +typedef union {
> +  struct {
> +    UINT8 ControlSignalsAOutputs              :  2; ///< Bits 0:1
> +    UINT8 ControlSignalsBOutputs              :  2; ///< Bits 3:2
> +    UINT8 Y1Y3ClockOutputs                    :  2; ///< Bits 5:4
> +    UINT8 Y0Y2ClockOutputs                    :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REGISTER_CONTROL_CONTROL_CLOCK;
> +
> +typedef union {
> +  struct {
> +    UINT8 Reserved0                           :  4; ///< Bits 0:3
> +    UINT8 Reserved1                           :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_RDIMM_REGISTER_CONTROL_RESERVED;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                             :  5; ///< Bits 4:0
> +    UINT8  Reserved                           :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                     :  4; ///< Bits 3:0
> +    UINT8  BackThickness                      :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                               :  5; ///< Bits 4:0
> +    UINT8  Revision                           :  2; ///< Bits 6:5
> +    UINT8  Extension                          :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterCount                      :  2; ///< Bits 1:0
> +    UINT8  DramRowCount                       :  2; ///< Bits 3:2
> +    UINT8  RegisterType                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MODULE_ATTRIBUTES;
> +
> +typedef union {
> +  struct {
> +    UINT8 AddressCommandPrelaunch             :  1; ///< Bits 0:0
> +    UINT8 Rank1Rank5Swap                      :  1; ///< Bits 1:1
> +    UINT8 Reserved0                           :  1; ///< Bits 2:2
> +    UINT8 Reserved1                           :  1; ///< Bits 3:3
> +    UINT8 AddressCommandOutputs               :  2; ///< Bits 5:4
> +    UINT8 QxCS_nOutputs                       :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_TIMING_CONTROL_DRIVE_STRENGTH;
> +
> +typedef union {
> +  struct {
> +    UINT8 QxOdtOutputs                        :  2; ///< Bits 1:0
> +    UINT8 QxCkeOutputs                        :  2; ///< Bits 3:2
> +    UINT8 Y1Y3ClockOutputs                    :  2; ///< Bits 5:4
> +    UINT8 Y0Y2ClockOutputs                    :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_TIMING_DRIVE_STRENGTH;
> +
> +typedef union {
> +  struct {
> +    UINT8 YExtendedDelay                      :  2; ///< Bits 1:0
> +    UINT8 QxCS_n                              :  2; ///< Bits 3:2
> +    UINT8 QxOdt                               :  2; ///< Bits 5:4
> +    UINT8 QxCke                               :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_EXTENDED_DELAY;
> +
> +typedef union {
> +  struct {
> +    UINT8 DelayY                              :  3; ///< Bits 2:0
> +    UINT8 Reserved                            :  1; ///< Bits 3:3
> +    UINT8 QxCS_n                              :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXCS_N_QXCA;
> +
> +typedef union {
> +  struct {
> +    UINT8 QxCS_n                              :  4; ///< Bits 3:0
> +    UINT8 QxOdt                               :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXODT_QXCKE;
> +
> +typedef union {
> +  struct {
> +    UINT8 RC8MdqOdtStrength                   :  3; ///< Bits 2:0
> +    UINT8 RC8Reserved                         :  1; ///< Bits 3:3
> +    UINT8 RC9MdqOdtStrength                   :  3; ///< Bits 6:4
> +    UINT8 RC9Reserved                         :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH;
> +
> +typedef union {
> +  struct {
> +    UINT8 RC10DA3ValueR0                      :  1; ///< Bits 0:0
> +    UINT8 RC10DA4ValueR0                      :  1; ///< Bits 1:1
> +    UINT8 RC10DA3ValueR1                      :  1; ///< Bits 2:2
> +    UINT8 RC10DA4ValueR1                      :  1; ///< Bits 3:3
> +    UINT8 RC11DA3ValueR0                      :  1; ///< Bits 4:4
> +    UINT8 RC11DA4ValueR0                      :  1; ///< Bits 5:5
> +    UINT8 RC11DA3ValueR1                      :  1; ///< Bits 6:6
> +    UINT8 RC11DA4ValueR1                      :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL;
> +
> +typedef union {
> +  struct {
> +    UINT8 Driver_Impedance                    :  2; ///< Bits 1:0
> +    UINT8 Rtt_Nom                             :  3; ///< Bits 4:2
> +    UINT8 Reserved                            :  1; ///< Bits 5:5
> +    UINT8 Rtt_WR                              :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MR_1_2;
> +
> +typedef union {
> +  struct {
> +    UINT8 MinimumDelayTime                    :  7; ///< Bits 0:6
> +    UINT8 Reserved                            :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD3_LRDIMM_MODULE_DELAY_TIME;
> +
> +typedef struct {
> +  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
> +  UINT8  Week;                                 ///< Year represented in BCD (47h = week
> 47)
> +} SPD3_MANUFACTURING_DATE;
> +
> +typedef union {
> +  UINT32 Data;
> +  UINT16 SerialNumber16[2];
> +  UINT8  SerialNumber8[4];
> +} SPD3_MANUFACTURER_SERIAL_NUMBER;
> +
> +typedef struct {
> +  UINT8 Location;                              ///< Module Manufacturing Location
> +} SPD3_MANUFACTURING_LOCATION;
> +
> +typedef struct {
> +  SPD3_MANUFACTURER_ID_CODE            IdCode;                   ///< Module
> Manufacturer ID Code
> +  SPD3_MANUFACTURING_LOCATION          Location;                 ///< Module
> Manufacturing Location
> +  SPD3_MANUFACTURING_DATE              Date;                     ///< Module
> Manufacturing Year, in BCD (range: 2000-2255)
> +  SPD3_MANUFACTURER_SERIAL_NUMBER      SerialNumber;             ///<
> Module Serial Number
> +} SPD3_UNIQUE_MODULE_ID;
> +
> +typedef union {
> +  UINT16 Crc[1];
> +  UINT8  Data8[2];
> +} SPD3_CYCLIC_REDUNDANCY_CODE;
> +
> +typedef struct {
> +  SPD3_DEVICE_DESCRIPTION_STRUCT       Description;              ///< 0
> Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
> +  SPD3_REVISION_STRUCT                 Revision;                 ///< 1   SPD Revision
> +  SPD3_DRAM_DEVICE_TYPE_STRUCT         DramDeviceType;           ///< 2
> DRAM Device Type
> +  SPD3_MODULE_TYPE_STRUCT              ModuleType;               ///< 3   Module
> Type
> +  SPD3_SDRAM_DENSITY_BANKS_STRUCT      SdramDensityAndBanks;
> ///< 4   SDRAM Density and Banks
> +  SPD3_SDRAM_ADDRESSING_STRUCT         SdramAddressing;          ///< 5
> SDRAM Addressing
> +  SPD3_MODULE_NOMINAL_VOLTAGE_STRUCT   ModuleNominalVoltage;
> ///< 6   Module Nominal Voltage, VDD
> +  SPD3_MODULE_ORGANIZATION_STRUCT      ModuleOrganization;       ///<
> 7   Module Organization
> +  SPD3_MODULE_MEMORY_BUS_WIDTH_STRUCT
> ModuleMemoryBusWidth;     ///< 8   Module Memory Bus Width
> +  SPD3_FINE_TIMEBASE_STRUCT            FineTimebase;             ///< 9   Fine
> Timebase (FTB) Dividend / Divisor
> +  SPD3_MEDIUM_TIMEBASE                 MediumTimebase;           ///< 10-11
> Medium Timebase (MTB) Dividend
> +  SPD3_TCK_MIN_MTB_STRUCT              tCKmin;                   ///< 12  SDRAM
> Minimum Cycle Time (tCKmin)
> +  UINT8                                Reserved0;                ///< 13  Reserved
> +  SPD3_CAS_LATENCIES_SUPPORTED_STRUCT  CasLatencies;             ///< 14-
> 15 CAS Latencies Supported
> +  SPD3_TAA_MIN_MTB_STRUCT              tAAmin;                   ///< 16  Minimum
> CAS Latency Time (tAAmin)
> +  SPD3_TWR_MIN_MTB_STRUCT              tWRmin;                   ///< 17  Minimum
> Write Recovery Time (tWRmin)
> +  SPD3_TRCD_MIN_MTB_STRUCT             tRCDmin;                  ///< 18  Minimum
> RAS# to CAS# Delay Time (tRCDmin)
> +  SPD3_TRRD_MIN_MTB_STRUCT             tRRDmin;                  ///< 19  Minimum
> Row Active to Row Active Delay Time (tRRDmin)
> +  SPD3_TRP_MIN_MTB_STRUCT              tRPmin;                   ///< 20  Minimum
> Row Precharge Delay Time (tRPmin)
> +  SPD3_TRAS_TRC_MIN_MTB_STRUCT         tRASMintRCMinUpper;       ///<
> 21  Upper Nibbles for tRAS and tRC
> +  SPD3_TRAS_MIN_MTB_STRUCT             tRASmin;                  ///< 22  Minimum
> Active to Precharge Delay Time (tRASmin), Least Significant Byte
> +  SPD3_TRC_MIN_MTB_STRUCT              tRCmin;                   ///< 23  Minimum
> Active to Active/Refresh Delay Time (tRCmin), Least Significant Byte
> +  SPD3_TRFC_MIN_MTB_STRUCT             tRFCmin;                  ///< 24-25
> Minimum Refresh Recovery Delay Time (tRFCmin)
> +  SPD3_TWTR_MIN_MTB_STRUCT             tWTRmin;                  ///< 26
> Minimum Internal Write to Read Command Delay Time (tWTRmin)
> +  SPD3_TRTP_MIN_MTB_STRUCT             tRTPmin;                  ///< 27  Minimum
> Internal Read to Precharge Command Delay Time (tRTPmin)
> +  SPD3_TFAW_MIN_MTB_UPPER_STRUCT       tFAWMinUpper;             ///< 28
> Upper Nibble for tFAW
> +  SPD3_TFAW_MIN_MTB_STRUCT             tFAWmin;                  ///< 29
> Minimum Four Activate Window Delay Time (tFAWmin)
> +  SPD3_SDRAM_OPTIONAL_FEATURES_STRUCT  SdramOptionalFeatures;
> ///< 30  SDRAM Optional Features
> +  SPD3_SDRAM_THERMAL_REFRESH_STRUCT    ThermalAndRefreshOptions;
> ///< 31  SDRAM Thermal And Refresh Options
> +  SPD3_MODULE_THERMAL_SENSOR_STRUCT    ModuleThermalSensor;
> ///< 32  Module Thermal Sensor
> +  SPD3_SDRAM_DEVICE_TYPE_STRUCT        SdramDeviceType;          ///< 33
> SDRAM Device Type
> +  SPD3_TCK_MIN_FTB_STRUCT              tCKminFine;               ///< 34  Fine
> Offset for SDRAM Minimum Cycle Time (tCKmin)
> +  SPD3_TAA_MIN_FTB_STRUCT              tAAminFine;               ///< 35  Fine
> Offset for Minimum CAS Latency Time (tAAmin)
> +  SPD3_TRCD_MIN_FTB_STRUCT             tRCDminFine;              ///< 36  Fine
> Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
> +  SPD3_TRP_MIN_FTB_STRUCT              tRPminFine;               ///< 37  Minimum
> Row Precharge Delay Time (tRPmin)
> +  SPD3_TRC_MIN_FTB_STRUCT              tRCminFine;               ///< 38  Fine
> Offset for Minimum Active to Active/Refresh Delay Time (tRCmin)
> +  UINT8                                Reserved1[40 - 39 + 1];   ///< 39 - 40 Reserved
> +  SPD3_MAXIMUM_ACTIVE_COUNT_STRUCT     MacValue;                 ///< 41
> SDRAM Maximum Active Count (MAC) Value
> +  UINT8                                Reserved2[59 - 42 + 1];   ///< 42 - 59 Reserved
> +} SPD3_BASE_SECTION;
> +
> +typedef struct {
> +  SPD3_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 60  Module Nominal Height
> +  SPD3_UNBUF_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;   ///< 61  Module Maximum Thickness
> +  SPD3_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 62  Reference Raw Card Used
> +  SPD3_UNBUF_ADDRESS_MAPPING           AddressMappingEdgeConn;   ///<
> 63  Address Mapping from Edge Connector to DRAM
> +  UINT8                                Reserved[116 - 64 + 1];   ///< 64-116 Reserved
> +} SPD3_MODULE_UNBUFFERED;
> +
> +typedef struct {
> +  SPD3_RDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 60  Module Nominal Height
> +  SPD3_RDIMM_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;   ///< 61  Module Maximum Thickness
> +  SPD3_RDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 62  Reference Raw Card Used
> +  SPD3_RDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;     ///<
> 63  DIMM Module Attributes
> +  SPD3_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION
> ThermalHeatSpreaderSolution; ///< 64     RDIMM Thermal Heat Spreader
> Solution
> +  SPD3_MANUFACTURER_ID_CODE
> RegisterManufacturerIdCode;  ///< 65-66  Register Manufacturer ID Code
> +  SPD3_RDIMM_REGISTER_REVISION_NUMBER
> RegisterRevisionNumber;      ///< 67     Register Revision Number
> +  SPD3_RDIMM_REGISTER_TYPE                        RegisterType; ///< 68  Register
> Type
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc1Rc0;       ///< 69
> RC1 (MS Nibble) / RC0 (LS Nibble) - Reserved
> +  SPD3_RDIMM_REGISTER_CONTROL_COMMAND_ADDRESS     Rc3Rc2;
> ///< 70  RC3 (MS Nibble) / RC2 (LS Nibble) - Drive Strength,
> Command/Address
> +  SPD3_RDIMM_REGISTER_CONTROL_CONTROL_CLOCK       Rc5Rc4;       ///<
> 71  RC5 (MS Nibble) / RC4 (LS Nibble) - Drive Strength, Control and Clock
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc7Rc6;       ///< 72
> RC7 (MS Nibble) / RC6 (LS Nibble) - Reserved for Register Vendor
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc9Rc8;       ///< 73
> RC9 (MS Nibble) / RC8 (LS Nibble) - Reserved
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc11Rc10;     ///< 74
> RC11 (MS Nibble) / RC10 (LS Nibble) - Reserved
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc13Rc12;     ///< 75
> RC12 (MS Nibble) / RC12 (LS Nibble) - Reserved
> +  SPD3_RDIMM_REGISTER_CONTROL_RESERVED            Rc15Rc14;     ///< 76
> RC15 (MS Nibble) / RC14 (LS Nibble) - Reserved
> +  UINT8                               Reserved[116 - 77 + 1];   ///< 77-116 Reserved
> +} SPD3_MODULE_REGISTERED;
> +
> +typedef struct {
> +  SPD3_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 60  Module Nominal Height
> +  SPD3_UNBUF_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;  ///< 61  Module Maximum Thickness
> +  SPD3_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 62  Reference Raw Card Used
> +  UINT8                                Reserved[116 - 63 + 1];  ///< 63-116 Reserved
> +} SPD3_MODULE_CLOCKED;
> +
> +typedef struct {
> +  SPD3_LRDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 60  Module Nominal Height
> +  SPD3_LRDIMM_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness; ///< 61  Module Maximum Thickness
> +  SPD3_LRDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 62  Reference Raw Card Used
> +  SPD3_LRDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;   ///<
> 63  Module Attributes
> +  UINT8                                         MemoryBufferRevisionNumber;       ///< 64
> Memory Buffer Revision Number
> +  SPD3_MANUFACTURER_ID_CODE                     ManufacturerIdCode;
> ///< 65-66 Memory Buffer Manufacturer ID Code
> +  SPD3_LRDIMM_TIMING_CONTROL_DRIVE_STRENGTH
> TimingControlDriveStrengthCaCs;   ///< 67    F0RC3 / F0RC2 - Timing Control &
> Drive Strength, CA & CS
> +  SPD3_LRDIMM_TIMING_DRIVE_STRENGTH             DriveStrength;
> ///< 68    F0RC5 / F0RC4 - Drive Strength, ODT & CKE and Y
> +  SPD3_LRDIMM_EXTENDED_DELAY                    ExtendedDelay;                    ///<
> 69    F1RC11 / F1RC8 - Extended Delay for Y, CS and ODT & CKE
> +  SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXCS_N_QXCA
> AdditiveDelayForCsCa;             ///< 70    F1RC13 / F1RC12 - Additive Delay for CS
> and CA
> +  SPD3_LRDIMM_ADDITIVE_DELAY_FOR_QXODT_QXCKE
> AdditiveDelayForOdtCke;           ///< 71    F1RC15 / F1RC14 - Additive Delay for
> ODT & CKE
> +  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH
> MdqTerminationDriveStrengthFor800_1066; ///< 72    F1RC15 / F1RC14 -
> Additive Delay for ODT & CKE
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_0_1QxOdtControlFor800_1066;  ///< 73    F[3,4]RC11 / F[3,4]RC10 - Rank
> 0 & 1 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_2_3QxOdtControlFor800_1066;  ///< 74    F[5,6]RC11 / F[5,6]RC10 - Rank
> 2 & 3 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_4_5QxOdtControlFor800_1066;  ///< 75    F[7,8]RC11 / F[7,8]RC10 - Rank
> 4 & 5 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_6_7QxOdtControlFor800_1066;  ///< 76    F[9,10]RC11 / F[9,10]RC10 -
> Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor800_1066;
> ///< 77    MR1,2 Registers for 800 & 1066
> +  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH
> MdqTerminationDriveStrengthFor1333_1600; ///< 78    F1RC15 / F1RC14 -
> Additive Delay for ODT & CKE
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_0_1QxOdtControlFor1333_1600; ///< 79    F[3,4]RC11 / F[3,4]RC10 -
> Rank 0 & 1 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_2_3QxOdtControlFor1333_1600; ///< 80    F[5,6]RC11 / F[5,6]RC10 -
> Rank 2 & 3 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_4_5QxOdtControlFor1333_1600; ///< 81    F[7,8]RC11 / F[7,8]RC10 -
> Rank 4 & 5 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_6_7QxOdtControlFor1333_1600; ///< 82    F[9,10]RC11 / F[9,10]RC10 -
> Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor1333_1600;
> ///< 83    MR1,2 Registers for 800 & 1066
> +  SPD3_LRDIMM_MDQ_TERMINATION_DRIVE_STRENGTH
> MdqTerminationDriveStrengthFor1866_2133; ///< 84    F1RC15 / F1RC14 -
> Additive Delay for ODT & CKE
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_0_1QxOdtControlFor1866_2133; ///< 85    F[3,4]RC11 / F[3,4]RC10 -
> Rank 0 & 1 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_2_3QxOdtControlFor1866_2133; ///< 86    F[5,6]RC11 / F[5,6]RC10 -
> Rank 2 & 3 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_4_5QxOdtControlFor1866_2133; ///< 87    F[7,8]RC11 / F[7,8]RC10 -
> Rank 4 & 5 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_RANK_READ_WRITE_QXODT_CONTROL
> Rank_6_7QxOdtControlFor1866_2133; ///< 88    F[9,10]RC11 / F[9,10]RC10 -
> Rank 6 & 7 RD & WR QxODT Control for 800 & 1066
> +  SPD3_LRDIMM_MR_1_2                            MR_1_2RegistersFor1866_2133;
> ///< 89    MR1,2 Registers for 800 & 1066
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MinimumModuleDelayTimeFor1_5V;    ///< 90    Minimum Module Delay
> Time for 1.5 V
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MaximumModuleDelayTimeFor1_5V;    ///< 91    Maximum Module Delay
> Time for 1.5 V
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MinimumModuleDelayTimeFor1_35V;   ///< 92    Minimum Module Delay
> Time for 1.35 V
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MaximumModuleDelayTimeFor1_35V;   ///< 93    Maximum Module Delay
> Time for 1.35 V
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MinimumModuleDelayTimeFor1_25V;   ///< 94    Minimum Module Delay
> Time for 1.25 V
> +  SPD3_LRDIMM_MODULE_DELAY_TIME
> MaximumModuleDelayTimeFor1_25V;   ///< 95    Maximum Module Delay
> Time for 1.25 V
> +  UINT8                                         Reserved[101 - 96 + 1];           ///< 96-101
> Reserved
> +  UINT8                                         PersonalityByte[116 - 102 + 1];   ///< 102-116
> Memory Buffer Personality Bytes
> +} SPD3_MODULE_LOADREDUCED;
> +
> +typedef union {
> +  SPD3_MODULE_UNBUFFERED              Unbuffered;               ///< 128-255
> Unbuffered Memory Module Types
> +  SPD3_MODULE_REGISTERED              Registered;               ///< 128-255
> Registered Memory Module Types
> +  SPD3_MODULE_CLOCKED                 Clocked;                  ///< 128-255
> Registered Memory Module Types
> +  SPD3_MODULE_LOADREDUCED             LoadReduced;              ///< 128-255
> Load Reduced Memory Module Types
> +} SPD3_MODULE_SPECIFIC;
> +
> +typedef struct {
> +  UINT8                          ModulePartNumber[145 - 128 + 1];        ///< 128-145
> Module Part Number
> +} SPD3_MODULE_PART_NUMBER;
> +
> +typedef struct {
> +  UINT8                          ModuleRevisionCode[147 - 146 + 1];      ///< 146-147
> Module Revision Code
> +} SPD3_MODULE_REVISION_CODE;
> +
> +typedef struct {
> +  UINT8                          ManufacturerSpecificData[175 - 150 + 1];///< 150-175
> Manufacturer's Specific Data
> +} SPD3_MANUFACTURER_SPECIFIC;
> +
> +///
> +/// DDR3 Serial Presence Detect structure
> +///
> +typedef struct {
> +  SPD3_BASE_SECTION           General;                                ///< 0-59    General
> Section
> +  SPD3_MODULE_SPECIFIC        Module;                                 ///< 60-116
> Module-Specific Section
> +  SPD3_UNIQUE_MODULE_ID       ModuleId;                               ///< 117-125
> Unique Module ID
> +  SPD3_CYCLIC_REDUNDANCY_CODE Crc;                                    ///< 126-127
> Cyclical Redundancy Code (CRC)
> +  SPD3_MODULE_PART_NUMBER     ModulePartNumber;                       ///<
> 128-145 Module Part Number
> +  SPD3_MODULE_REVISION_CODE   ModuleRevisionCode;                     ///<
> 146-147 Module Revision Code
> +  SPD3_MANUFACTURER_ID_CODE   DramIdCode;                             ///< 148-
> 149 Dram Manufacturer ID Code
> +  SPD3_MANUFACTURER_SPECIFIC  ManufacturerSpecificData;               ///<
> 150-175 Manufacturer's Specific Data
> +  UINT8                       Reserved[255 - 176 + 1];                ///< 176-255 Open for
> Customer Use
> +} SPD_DDR3;
> +
> +#pragma pack (pop)
> +#endif
> diff --git a/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
> b/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
> new file mode 100644
> index 0000000..0eabb6c
> --- /dev/null
> +++ b/MdePkg/Include/IndustryStandard/SdramSpdDdr4.h
> @@ -0,0 +1,958 @@
> +/** @file
> +  This file contains definitions for SPD DDR4.
> +
> +  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
> +  This program and the accompanying materials
> +  are licensed and made available under the terms and conditions of the BSD
> License
> +  which accompanies this distribution.  The full text of the license may be
> found at
> +  http://opensource.org/licenses/bsd-license.php
> +
> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> +  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +
> +  @par Revision Reference:
> +    - Serial Presence Detect (SPD) for DDR4 SDRAM Modules Document
> Release 4
> +      http://www.jedec.org/standards-documents/docs/spd412l-4
> +**/
> +
> +#ifndef _SDRAM_SPD_DDR4_H_
> +#define _SDRAM_SPD_DDR4_H_
> +
> +#pragma pack (push, 1)
> +
> +typedef union {
> +  struct {
> +    UINT8  BytesUsed                           :  4; ///< Bits 3:0
> +    UINT8  BytesTotal                          :  3; ///< Bits 6:4
> +    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_DEVICE_DESCRIPTION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Minor                               :  4; ///< Bits 3:0
> +    UINT8  Major                               :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_REVISION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Type                                :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_DRAM_DEVICE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ModuleType                          :  4; ///< Bits 3:0
> +    UINT8  HybridMedia                         :  3; ///< Bits 6:4
> +    UINT8  Hybrid                              :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_MODULE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Density                             :  4; ///< Bits 3:0
> +    UINT8  BankAddress                         :  2; ///< Bits 5:4
> +    UINT8  BankGroup                           :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_SDRAM_DENSITY_BANKS_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
> +    UINT8  RowAddress                          :  3; ///< Bits 5:3
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_SDRAM_ADDRESSING_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SignalLoading                       :  2; ///< Bits 1:0
> +    UINT8  Reserved                            :  2; ///< Bits 3:2
> +    UINT8  DieCount                            :  3; ///< Bits 6:4
> +    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_PRIMARY_SDRAM_PACKAGE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
> +    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_SDRAM_OPTIONAL_FEATURES_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_SDRAM_THERMAL_REFRESH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  5; ///< Bits 4:0
> +    UINT8  SoftPPR                             :  1; ///< Bits 5:5
> +    UINT8  PostPackageRepair                   :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SignalLoading                       :  2; ///< Bits 1:0
> +    UINT8  DRAMDensityRatio                    :  2; ///< Bits 3:2
> +    UINT8  DieCount                            :  3; ///< Bits 6:4
> +    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_SECONDARY_SDRAM_PACKAGE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  OperationAt1_20                     :  1; ///< Bits 0:0
> +    UINT8  EndurantAt1_20                      :  1; ///< Bits 1:1
> +    UINT8  Reserved                            :  6; ///< Bits 7:2
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_MODULE_NOMINAL_VOLTAGE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
> +    UINT8  RankCount                           :  3; ///< Bits 5:3
> +    UINT8  RankMix                             :  1; ///< Bits 6:6
> +    UINT8  Reserved                            :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_MODULE_ORGANIZATION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
> +    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
> +    UINT8  Reserved                            :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_MODULE_MEMORY_BUS_WIDTH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  7; ///< Bits 6:0
> +    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_MODULE_THERMAL_SENSOR_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ExtendedBaseModuleType              :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_EXTENDED_MODULE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Fine                                :  2; ///< Bits 1:0
> +    UINT8  Medium                              :  2; ///< Bits 3:2
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TIMEBASE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCKmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TCK_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCKmax                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TCK_MAX_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT32 Cl7                                 :  1; ///< Bits 0:0
> +    UINT32 Cl8                                 :  1; ///< Bits 1:1
> +    UINT32 Cl9                                 :  1; ///< Bits 2:2
> +    UINT32 Cl10                                :  1; ///< Bits 3:3
> +    UINT32 Cl11                                :  1; ///< Bits 4:4
> +    UINT32 Cl12                                :  1; ///< Bits 5:5
> +    UINT32 Cl13                                :  1; ///< Bits 6:6
> +    UINT32 Cl14                                :  1; ///< Bits 7:7
> +    UINT32 Cl15                                :  1; ///< Bits 8:8
> +    UINT32 Cl16                                :  1; ///< Bits 9:9
> +    UINT32 Cl17                                :  1; ///< Bits 10:10
> +    UINT32 Cl18                                :  1; ///< Bits 11:11
> +    UINT32 Cl19                                :  1; ///< Bits 12:12
> +    UINT32 Cl20                                :  1; ///< Bits 13:13
> +    UINT32 Cl21                                :  1; ///< Bits 14:14
> +    UINT32 Cl22                                :  1; ///< Bits 15:15
> +    UINT32 Cl23                                :  1; ///< Bits 16:16
> +    UINT32 Cl24                                :  1; ///< Bits 17:17
> +    UINT32 Cl25                                :  1; ///< Bits 18:18
> +    UINT32 Cl26                                :  1; ///< Bits 19:19
> +    UINT32 Cl27                                :  1; ///< Bits 20:20
> +    UINT32 Cl28                                :  1; ///< Bits 21:21
> +    UINT32 Cl29                                :  1; ///< Bits 22:22
> +    UINT32 Cl30                                :  1; ///< Bits 23:23
> +    UINT32 Cl31                                :  1; ///< Bits 24:24
> +    UINT32 Cl32                                :  1; ///< Bits 25:25
> +    UINT32 Cl33                                :  1; ///< Bits 26:26
> +    UINT32 Cl34                                :  1; ///< Bits 27:27
> +    UINT32 Cl35                                :  1; ///< Bits 28:28
> +    UINT32 Cl36                                :  1; ///< Bits 29:29
> +    UINT32 Reserved                            :  1; ///< Bits 30:30
> +    UINT32 ClRange                             :  1; ///< Bits 31:31
> +  } Bits;
> +  struct {
> +    UINT32 Cl23                                :  1; ///< Bits 0:0
> +    UINT32 Cl24                                :  1; ///< Bits 1:1
> +    UINT32 Cl25                                :  1; ///< Bits 2:2
> +    UINT32 Cl26                                :  1; ///< Bits 3:3
> +    UINT32 Cl27                                :  1; ///< Bits 4:4
> +    UINT32 Cl28                                :  1; ///< Bits 5:5
> +    UINT32 Cl29                                :  1; ///< Bits 6:6
> +    UINT32 Cl30                                :  1; ///< Bits 7:7
> +    UINT32 Cl31                                :  1; ///< Bits 8:8
> +    UINT32 Cl32                                :  1; ///< Bits 9:9
> +    UINT32 Cl33                                :  1; ///< Bits 10:10
> +    UINT32 Cl34                                :  1; ///< Bits 11:11
> +    UINT32 Cl35                                :  1; ///< Bits 12:12
> +    UINT32 Cl36                                :  1; ///< Bits 13:13
> +    UINT32 Cl37                                :  1; ///< Bits 14:14
> +    UINT32 Cl38                                :  1; ///< Bits 15:15
> +    UINT32 Cl39                                :  1; ///< Bits 16:16
> +    UINT32 Cl40                                :  1; ///< Bits 17:17
> +    UINT32 Cl41                                :  1; ///< Bits 18:18
> +    UINT32 Cl42                                :  1; ///< Bits 19:19
> +    UINT32 Cl43                                :  1; ///< Bits 20:20
> +    UINT32 Cl44                                :  1; ///< Bits 21:21
> +    UINT32 Cl45                                :  1; ///< Bits 22:22
> +    UINT32 Cl46                                :  1; ///< Bits 23:23
> +    UINT32 Cl47                                :  1; ///< Bits 24:24
> +    UINT32 Cl48                                :  1; ///< Bits 25:25
> +    UINT32 Cl49                                :  1; ///< Bits 26:26
> +    UINT32 Cl50                                :  1; ///< Bits 27:27
> +    UINT32 Cl51                                :  1; ///< Bits 28:28
> +    UINT32 Cl52                                :  1; ///< Bits 29:29
> +    UINT32 Reserved                            :  1; ///< Bits 30:30
> +    UINT32 ClRange                             :  1; ///< Bits 31:31
> +  } HighRangeBits;
> +  UINT32 Data;
> +  UINT16 Data16[2];
> +  UINT8  Data8[4];
> +} SPD4_CAS_LATENCIES_SUPPORTED_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tAAmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TAA_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRCDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRCD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRPmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRP_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRASminUpper                        :  4; ///< Bits 3:0
> +    UINT8  tRCminUpper                         :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRAS_TRC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRASmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRAS_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRCmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT16 tRFCmin                             :  16; ///< Bits 15:0
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD4_TRFC_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tFAWminUpper                        :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TFAW_MIN_MTB_UPPER_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tFAWmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TFAW_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRRDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TRRD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCCDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TCCD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWRminMostSignificantNibble         :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TWR_UPPER_NIBBLE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWRmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TWR_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWTR_SminMostSignificantNibble      :  4; ///< Bits 3:0
> +    UINT8  tWTR_LminMostSignificantNibble      :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TWTR_UPPER_NIBBLE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tWTRmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_TWTR_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  BitOrderatSDRAM                     :  5; ///< Bits 4:0
> +    UINT8  WiredtoUpperLowerNibble             :  1; ///< Bits 5:5
> +    UINT8  PackageRankMap                      :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_CONNECTOR_BIT_MAPPING_BYTE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCCDminFine                          :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TCCD_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRRDminFine                          :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TRRD_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRCminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TRC_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRPminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TRP_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRCDminFine                          :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TRCD_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tAAminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TAA_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCKmaxFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TCK_MAX_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCKminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD4_TCK_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                              :  5; ///< Bits 4:0
> +    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_UNBUF_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                      :  4; ///< Bits 3:0
> +    UINT8  BackThickness                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_UNBUF_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_UNBUF_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  MappingRank1                        :  1; ///< Bits 0:0
> +    UINT8  Reserved                            :  7; ///< Bits 7:1
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_UNBUF_ADDRESS_MAPPING;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                              :  5; ///< Bits 4:0
> +    UINT8  Reserved                            :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                      :  4; ///< Bits 3:0
> +    UINT8  BackThickness                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterCount                       :  2; ///< Bits 1:0
> +    UINT8  DramRowCount                        :  2; ///< Bits 3:2
> +    UINT8  RegisterType                        :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_MODULE_ATTRIBUTES;
> +
> +typedef union {
> +  struct {
> +    UINT8  HeatSpreaderThermalCharacteristics  :  7; ///< Bits 6:0
> +    UINT8  HeatSpreaderSolution                :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
> +
> +typedef union {
> +  struct {
> +    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
> +    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
> +    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD4_MANUFACTURER_ID_CODE;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterRevisionNumber;             ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_REGISTER_REVISION_NUMBER;
> +
> +typedef union {
> +  struct {
> +    UINT8 Rank1Mapping                        :  1; ///< Bits 0:0
> +    UINT8 Reserved                            :  7; ///< Bits 7:1
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM;
> +
> +typedef union {
> +  struct {
> +    UINT8 Cke                                 :  2; ///< Bits 1:0
> +    UINT8 Odt                                 :  2; ///< Bits 3:2
> +    UINT8 CommandAddress                      :  2; ///< Bits 5:4
> +    UINT8 ChipSelect                          :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +}
> SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COM
> MAND_ADDRESS;
> +
> +typedef union {
> +  struct {
> +    UINT8 Y0Y2                                :  2; ///< Bits 1:0
> +    UINT8 Y1Y3                                :  2; ///< Bits 3:2
> +    UINT8 Reserved0                           :  2; ///< Bits 5:4
> +    UINT8 RcdOutputSlewRateControl            :  1; ///< Bits 6:6
> +    UINT8 Reserved1                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                             :  5; ///< Bits 4:0
> +    UINT8  Reserved                           :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                     :  4; ///< Bits 3:0
> +    UINT8  BackThickness                      :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_MODULE_NOMINAL_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                               :  5; ///< Bits 4:0
> +    UINT8  Revision                           :  2; ///< Bits 6:5
> +    UINT8  Extension                          :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterCount                      :  2; ///< Bits 1:0
> +    UINT8  DramRowCount                       :  2; ///< Bits 3:2
> +    UINT8  RegisterType                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_MODULE_ATTRIBUTES;
> +
> +typedef union {
> +  struct {
> +    UINT8  HeatSpreaderThermalCharacteristics :  7; ///< Bits 6:0
> +    UINT8  HeatSpreaderSolution               :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_THERMAL_HEAT_SPREADER_SOLUTION;
> +
> +typedef union {
> +  struct {
> +    UINT8  RegisterRevisionNumber;                  ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_REGISTER_REVISION_NUMBER;
> +
> +typedef union {
> +  struct {
> +    UINT8 Rank1Mapping                        :  1; ///< Bits 0:0
> +    UINT8 Reserved                            :  7; ///< Bits 7:1
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM;
> +
> +typedef union {
> +  struct {
> +    UINT8 Cke                                 :  2; ///< Bits 1:0
> +    UINT8 Odt                                 :  2; ///< Bits 3:2
> +    UINT8 CommandAddress                      :  2; ///< Bits 5:4
> +    UINT8 ChipSelect                          :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +}
> SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_CO
> MMAND_ADDRESS;
> +
> +typedef union {
> +  struct {
> +    UINT8 Y0Y2                                :  2; ///< Bits 1:0
> +    UINT8 Y1Y3                                :  2; ///< Bits 3:2
> +    UINT8 Reserved0                           :  2; ///< Bits 5:4
> +    UINT8 RcdOutputSlewRateControl            :  1; ///< Bits 6:6
> +    UINT8 Reserved1                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK;
> +
> +typedef struct {
> +  UINT8  DataBufferRevisionNumber;
> +} SPD4_LRDIMM_DATA_BUFFER_REVISION_NUMBER;
> +
> +typedef union {
> +  struct {
> +    UINT8  DramVrefDQForPackageRank0          :  6; ///< Bits 5:0
> +    UINT8  Reserved                           :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK;
> +
> +typedef struct {
> +  UINT8  DataBufferVrefDQforDramInterface;
> +} SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE;
> +
> +typedef union {
> +  struct {
> +    UINT8  DramInterfaceMdqDriveStrength           :  4; ///< Bits 3:0
> +    UINT8  DramInterfaceMdqReadTerminationStrength :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +}
> SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_R
> ATE;
> +
> +typedef union {
> +  struct {
> +    UINT8  DataRateLe1866                           :  2; ///< Bits 1:0
> +    UINT8  DataRateLe2400                           :  2; ///< Bits 3:2
> +    UINT8  DataRateLe3200                           :  2; ///< Bits 5:4
> +    UINT8  Reserved                                 :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_DRAM_DRIVE_STRENGTH;
> +
> +typedef union {
> +  struct {
> +    UINT8  Rtt_Nom                                  :  3; ///< Bits 2:0
> +    UINT8  Rtt_WR                                   :  3; ///< Bits 5:3
> +    UINT8  Reserved                                 :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE;
> +
> +typedef union {
> +  struct {
> +    UINT8  PackageRanks0_1                          :  3; ///< Bits 2:0
> +    UINT8  PackageRanks2_3                          :  3; ///< Bits 5:3
> +    UINT8  Reserved                                 :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE;
> +
> +typedef union {
> +  struct {
> +    UINT8  Rank0                                    :  1; ///< Bits 0:0
> +    UINT8  Rank1                                    :  1; ///< Bits 1:1
> +    UINT8  Rank2                                    :  1; ///< Bits 2:2
> +    UINT8  Rank3                                    :  1; ///< Bits 3:3
> +    UINT8  DataBuffer                               :  1; ///< Bits 4:4
> +    UINT8  Reserved                                 :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +}
> SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE_RANGE;
> +
> +typedef union {
> +  struct {
> +    UINT8  DataBufferGainAdjustment                 :  1; ///< Bits 0:0
> +    UINT8  DataBufferDfe                            :  1; ///< Bits 1:1
> +    UINT8  Reserved                                 :  6; ///< Bits 7:2
> +  } Bits;
> +  UINT8  Data;
> +}
> SPD4_LRDIMM_DATA_BUFFER_DQ_DECISION_FEEDBACK_EQUALIZATION;
> +
> +typedef UINT16 SPD4_NVDIMM_MODULE_PRODUCT_IDENTIFIER;
> +
> +typedef union {
> +  struct {
> +    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
> +    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
> +    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_MANUFACTURER_ID_CODE;
> +
> +typedef UINT16 SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_IDENTIFIER;
> +
> +typedef UINT8
> SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_REVISION_CODE;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_NVDIMM_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  4; ///< Bits 3:0
> +    UINT8  Extension                           :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD4_NVDIMM_MODULE_CHARACTERISTICS;
> +
> +typedef struct {
> +  UINT8  Reserved;
> +  UINT8  MediaType;
> +} SPD4_NVDIMM_HYBRID_MODULE_MEDIA_TYPES;
> +
> +typedef UINT8
> SPD4_NVDIMM_MAXIMUM_NONVOLATILE_MEMORY_INITIALIZATION_TI
> ME;
> +
> +typedef union {
> +  struct {
> +    UINT16 FunctionInterface                   :  5; ///< Bits 4:0
> +    UINT16 FunctionClass                       :  5; ///< Bits 9:5
> +    UINT16 BlockOffset                         :  4; ///< Bits 13:10
> +    UINT16 Reserved                            :  1; ///< Bits 14:14
> +    UINT16 Implemented                         :  1; ///< Bits 15:15
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD4_NVDIMM_FUNCTION_INTERFACE_DESCRIPTOR;
> +
> +typedef struct {
> +  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
> +  UINT8  Week;                                 ///< Year represented in BCD (47h = week
> 47)
> +} SPD4_MANUFACTURING_DATE;
> +
> +typedef union {
> +  UINT32 Data;
> +  UINT16 SerialNumber16[2];
> +  UINT8  SerialNumber8[4];
> +} SPD4_MANUFACTURER_SERIAL_NUMBER;
> +
> +typedef struct {
> +  UINT8 Location;                              ///< Module Manufacturing Location
> +} SPD4_MANUFACTURING_LOCATION;
> +
> +typedef struct {
> +  SPD4_MANUFACTURER_ID_CODE            IdCode;                   ///< Module
> Manufacturer ID Code
> +  SPD4_MANUFACTURING_LOCATION          Location;                 ///< Module
> Manufacturing Location
> +  SPD4_MANUFACTURING_DATE              Date;                     ///< Module
> Manufacturing Year, in BCD (range: 2000-2255)
> +  SPD4_MANUFACTURER_SERIAL_NUMBER      SerialNumber;             ///<
> Module Serial Number
> +} SPD4_UNIQUE_MODULE_ID;
> +
> +typedef union {
> +  UINT16 Crc[1];
> +  UINT8  Data8[2];
> +} SPD4_CYCLIC_REDUNDANCY_CODE;
> +
> +typedef struct {
> +  SPD4_DEVICE_DESCRIPTION_STRUCT            Description;              ///< 0
> Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
> +  SPD4_REVISION_STRUCT                      Revision;                 ///< 1       SPD
> Revision
> +  SPD4_DRAM_DEVICE_TYPE_STRUCT              DramDeviceType;           ///< 2
> DRAM Device Type
> +  SPD4_MODULE_TYPE_STRUCT                   ModuleType;               ///< 3
> Module Type
> +  SPD4_SDRAM_DENSITY_BANKS_STRUCT           SdramDensityAndBanks;
> ///< 4       SDRAM Density and Banks
> +  SPD4_SDRAM_ADDRESSING_STRUCT              SdramAddressing;          ///< 5
> SDRAM Addressing
> +  SPD4_PRIMARY_SDRAM_PACKAGE_TYPE_STRUCT
> PrimarySdramPackageType;  ///< 6       Primary SDRAM Package Type
> +  SPD4_SDRAM_OPTIONAL_FEATURES_STRUCT       SdramOptionalFeatures;
> ///< 7       SDRAM Optional Features
> +  SPD4_SDRAM_THERMAL_REFRESH_STRUCT
> ThermalAndRefreshOptions; ///< 8       SDRAM Thermal and Refresh Options
> +  SPD4_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT
> OtherOptionalFeatures;    ///< 9       Other SDRAM Optional Features
> +  SPD4_SECONDARY_SDRAM_PACKAGE_TYPE_STRUCT
> SecondarySdramPackageType;///< 10      Secondary SDRAM Package Type
> +  SPD4_MODULE_NOMINAL_VOLTAGE_STRUCT
> ModuleNominalVoltage;     ///< 11      Module Nominal Voltage, VDD
> +  SPD4_MODULE_ORGANIZATION_STRUCT           ModuleOrganization;
> ///< 12      Module Organization
> +  SPD4_MODULE_MEMORY_BUS_WIDTH_STRUCT
> ModuleMemoryBusWidth;     ///< 13      Module Memory Bus Width
> +  SPD4_MODULE_THERMAL_SENSOR_STRUCT         ModuleThermalSensor;
> ///< 14      Module Thermal Sensor
> +  SPD4_EXTENDED_MODULE_TYPE_STRUCT          ExtendedModuleType;
> ///< 15      Extended Module Type
> +  UINT8                                     Reserved0;                ///< 16      Reserved
> +  SPD4_TIMEBASE_STRUCT                      Timebase;                 ///< 17
> Timebases
> +  SPD4_TCK_MIN_MTB_STRUCT                   tCKmin;                   ///< 18
> SDRAM Minimum Cycle Time (tCKmin)
> +  SPD4_TCK_MAX_MTB_STRUCT                   tCKmax;                   ///< 19
> SDRAM Maximum Cycle Time (tCKmax)
> +  SPD4_CAS_LATENCIES_SUPPORTED_STRUCT       CasLatencies;             ///<
> 20-23   CAS Latencies Supported
> +  SPD4_TAA_MIN_MTB_STRUCT                   tAAmin;                   ///< 24
> Minimum CAS Latency Time (tAAmin)
> +  SPD4_TRCD_MIN_MTB_STRUCT                  tRCDmin;                  ///< 25
> Minimum RAS# to CAS# Delay Time (tRCDmin)
> +  SPD4_TRP_MIN_MTB_STRUCT                   tRPmin;                   ///< 26
> Minimum Row Precharge Delay Time (tRPmin)
> +  SPD4_TRAS_TRC_MIN_MTB_STRUCT              tRASMintRCMinUpper;
> ///< 27      Upper Nibbles for tRAS and tRC
> +  SPD4_TRAS_MIN_MTB_STRUCT                  tRASmin;                  ///< 28
> Minimum Active to Precharge Delay Time (tRASmin), Least Significant Byte
> +  SPD4_TRC_MIN_MTB_STRUCT                   tRCmin;                   ///< 29
> Minimum Active to Active/Refresh Delay Time (tRCmin), Least Significant
> Byte
> +  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC1min;                 ///< 30-31
> Minimum Refresh Recovery Delay Time (tRFC1min)
> +  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC2min;                 ///< 32-33
> Minimum Refresh Recovery Delay Time (tRFC2min)
> +  SPD4_TRFC_MIN_MTB_STRUCT                  tRFC4min;                 ///< 34-35
> Minimum Refresh Recovery Delay Time (tRFC4min)
> +  SPD4_TFAW_MIN_MTB_UPPER_STRUCT            tFAWMinUpper;             ///<
> 36      Upper Nibble for tFAW
> +  SPD4_TFAW_MIN_MTB_STRUCT                  tFAWmin;                  ///< 37
> Minimum Four Activate Window Delay Time (tFAWmin)
> +  SPD4_TRRD_MIN_MTB_STRUCT                  tRRD_Smin;                ///< 38
> Minimum Activate to Activate Delay Time (tRRD_Smin), different bank group
> +  SPD4_TRRD_MIN_MTB_STRUCT                  tRRD_Lmin;                ///< 39
> Minimum Activate to Activate Delay Time (tRRD_Lmin), same bank group
> +  SPD4_TCCD_MIN_MTB_STRUCT                  tCCD_Lmin;                ///< 40
> Minimum CAS to CAS Delay Time (tCCD_Lmin), Same Bank Group
> +  SPD4_TWR_UPPER_NIBBLE_STRUCT              tWRUpperNibble;           ///< 41
> Upper Nibble for tWRmin
> +  SPD4_TWR_MIN_MTB_STRUCT                   tWRmin;                   ///< 42
> Minimum Write Recovery Time (tWRmin)
> +  SPD4_TWTR_UPPER_NIBBLE_STRUCT             tWTRUpperNibble;          ///<
> 43      Upper Nibbles for tWTRmin
> +  SPD4_TWTR_MIN_MTB_STRUCT                  tWTR_Smin;                ///< 44
> Minimum Write to Read Time (tWTR_Smin), Different Bank Group
> +  SPD4_TWTR_MIN_MTB_STRUCT                  tWTR_Lmin;                ///< 45
> Minimum Write to Read Time (tWTR_Lmin), Same Bank Group
> +  UINT8                                     Reserved1[59 - 46 + 1];   ///< 46-59   Reserved
> +  SPD4_CONNECTOR_BIT_MAPPING_BYTE_STRUCT    BitMapping[77 - 60 +
> 1];  ///< 60-77   Connector to SDRAM Bit Mapping
> +  UINT8                                     Reserved2[116 - 78 + 1];  ///< 78-116  Reserved
> +  SPD4_TCCD_MIN_FTB_STRUCT                  tCCD_LminFine;            ///< 117
> Fine Offset for Minimum CAS to CAS Delay Time (tCCD_Lmin), same bank
> group
> +  SPD4_TRRD_MIN_FTB_STRUCT                  tRRD_LminFine;            ///< 118
> Fine Offset for Minimum Activate to Activate Delay Time (tRRD_Lmin),
> different bank group
> +  SPD4_TRRD_MIN_FTB_STRUCT                  tRRD_SminFine;            ///< 119
> Fine Offset for Minimum Activate to Activate Delay Time (tRRD_Smin), same
> bank group
> +  SPD4_TRC_MIN_FTB_STRUCT                   tRCminFine;               ///< 120     Fine
> Offset for Minimum Active to Active/Refresh Delay Time (tRCmin)
> +  SPD4_TRP_MIN_FTB_STRUCT                   tRPminFine;               ///< 121     Fine
> Offset for Minimum Row Precharge Delay Time (tRPabmin)
> +  SPD4_TRCD_MIN_FTB_STRUCT                  tRCDminFine;              ///< 122
> Fine Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
> +  SPD4_TAA_MIN_FTB_STRUCT                   tAAminFine;               ///< 123     Fine
> Offset for Minimum CAS Latency Time (tAAmin)
> +  SPD4_TCK_MAX_FTB_STRUCT                   tCKmaxFine;               ///< 124     Fine
> Offset for SDRAM Minimum Cycle Time (tCKmax)
> +  SPD4_TCK_MIN_FTB_STRUCT                   tCKminFine;               ///< 125     Fine
> Offset for SDRAM Maximum Cycle Time (tCKmin)
> +  SPD4_CYCLIC_REDUNDANCY_CODE               Crc;                      ///< 126-127
> Cyclical Redundancy Code (CRC)
> +} SPD4_BASE_SECTION;
> +
> +typedef struct {
> +  SPD4_UNBUF_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 128     Module Nominal Height
> +  SPD4_UNBUF_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
> +  SPD4_UNBUF_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 130     Reference Raw Card Used
> +  SPD4_UNBUF_ADDRESS_MAPPING           AddressMappingEdgeConn;   ///<
> 131     Address Mapping from Edge Connector to DRAM
> +  UINT8                                Reserved[253 - 132 + 1];  ///< 132-253 Reserved
> +  SPD4_CYCLIC_REDUNDANCY_CODE          Crc;                      ///< 254-255
> Cyclical Redundancy Code (CRC)
> +} SPD4_MODULE_UNBUFFERED;
> +
> +typedef struct {
> +  SPD4_RDIMM_MODULE_NOMINAL_HEIGHT     ModuleNominalHeight;
> ///< 128     Module Nominal Height
> +  SPD4_RDIMM_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
> +  SPD4_RDIMM_REFERENCE_RAW_CARD        ReferenceRawCardUsed;
> ///< 130     Reference Raw Card Used
> +  SPD4_RDIMM_MODULE_ATTRIBUTES         DimmModuleAttributes;     ///<
> 131     DIMM Module Attributes
> +  SPD4_RDIMM_THERMAL_HEAT_SPREADER_SOLUTION
> DimmThermalHeatSpreaderSolution;     ///< 132     RDIMM Thermal Heat
> Spreader Solution
> +  SPD4_MANUFACTURER_ID_CODE
> RegisterManufacturerIdCode;          ///< 133-134 Register Manufacturer ID
> Code
> +  SPD4_RDIMM_REGISTER_REVISION_NUMBER
> RegisterRevisionNumber;              ///< 135     Register Revision Number
> +  SPD4_RDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM
> AddressMappingFromRegisterToDRAM;    ///< 136     Address Mapping from
> Register to DRAM
> +
> SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_COM
> MAND_ADDRESS RegisterOutputDriveStrengthForControlCommandAddress;
> ///< 137 Register Output Drive Strength for Control and Command Address
> +  SPD4_RDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK
> RegisterOutputDriveStrengthForClock; ///< 138     Register Output Drive
> Strength for Clock
> +  UINT8                                                                 Reserved[253 - 139 + 1];             ///<
> 253-139 Reserved
> +  SPD4_CYCLIC_REDUNDANCY_CODE                                           Crc;
> ///< 254-255 Cyclical Redundancy Code (CRC)
> +} SPD4_MODULE_REGISTERED;
> +
> +typedef struct {
> +  SPD4_LRDIMM_MODULE_NOMINAL_HEIGHT           ModuleNominalHeight;
> ///< 128     Module Nominal Height
> +  SPD4_LRDIMM_MODULE_NOMINAL_THICKNESS
> ModuleMaximumThickness;      ///< 129     Module Maximum Thickness
> +  SPD4_LRDIMM_REFERENCE_RAW_CARD              ReferenceRawCardUsed;
> ///< 130     Reference Raw Card Used
> +  SPD4_LRDIMM_MODULE_ATTRIBUTES               DimmModuleAttributes;
> ///< 131     DIMM Module Attributes
> +  SPD4_LRDIMM_THERMAL_HEAT_SPREADER_SOLUTION
> ThermalHeatSpreaderSolution; ///< 132     RDIMM Thermal Heat Spreader
> Solution
> +  SPD4_MANUFACTURER_ID_CODE                   RegisterManufacturerIdCode;
> ///< 133-134 Register Manufacturer ID Code
> +  SPD4_LRDIMM_REGISTER_REVISION_NUMBER
> RegisterRevisionNumber;      ///< 135     Register Revision Number
> +  SPD4_LRDIMM_ADDRESS_MAPPING_FROM_REGISTER_TO_DRAM
> AddressMappingFromRegisterToDram;                       ///< 136 Address Mapping
> from Register to DRAM
> +
> SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CONTROL_CO
> MMAND_ADDRESS
> RegisterOutputDriveStrengthForControlCommandAddress;    ///< 137
> Register Output Drive Strength for Control and Command Address
> +  SPD4_LRDIMM_REGISTER_OUTPUT_DRIVE_STRENGTH_FOR_CLOCK
> RegisterOutputDriveStrengthForClock;                    ///< 138 Register Output
> Drive Strength for Clock
> +  SPD4_LRDIMM_DATA_BUFFER_REVISION_NUMBER
> DataBufferRevisionNumber;    ///< 139     Data Buffer Revision Number
> +  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK
> DramVrefDQForPackageRank0;   ///< 140     DRAM VrefDQ for Package Rank 0
> +  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK
> DramVrefDQForPackageRank1;   ///< 141     DRAM VrefDQ for Package Rank 1
> +  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK
> DramVrefDQForPackageRank2;   ///< 142     DRAM VrefDQ for Package Rank 2
> +  SPD4_LRDIMM_DRAM_VREFDQ_FOR_PACKAGE_RANK
> DramVrefDQForPackageRank3;   ///< 143     DRAM VrefDQ for Package Rank 3
> +  SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE
> DataBufferVrefDQForDramInterface;               ///< 144     Data Buffer VrefDQ
> for DRAM Interface
> +
> SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_R
> ATE        DataBufferMdqDriveStrengthRttForDataRateLe1866; ///< 145     Data
> Buffer MDQ Drive Strength and RTT for data rate <= 1866
> +
> SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_R
> ATE        DataBufferMdqDriveStrengthRttForDataRateLe2400; ///< 146     Data
> Buffer MDQ Drive Strength and RTT for data rate <=2400
> +
> SPD4_LRDIMM_DATA_BUFFER_MDQ_DRIVE_STRENGTH_RTT_FOR_DATA_R
> ATE        DataBufferMdqDriveStrengthRttForDataRateLe3200; ///< 147     Data
> Buffer MDQ Drive Strength and RTT for data rate <=3200
> +  SPD4_LRDIMM_DRAM_DRIVE_STRENGTH
> DramDriveStrength;                              ///< 148     DRAM Drive Strength
> +  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE
> DramOdtRttWrRttNomForDataRateLe1866;            ///< 149     DRAM ODT
> (RTT_WR and RTT_NOM) for data rate <= 1866
> +  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE
> DramOdtRttWrRttNomForDataRateLe2400;            ///< 150     DRAM ODT
> (RTT_WR and RTT_NOM) for data rate <= 2400
> +  SPD4_LRDIMM_DRAM_ODT_RTT_WR_RTT_NOM_FOR_DATA_RATE
> DramOdtRttWrRttNomForDataRateLe3200;            ///< 151     DRAM ODT
> (RTT_WR and RTT_NOM) for data rate <= 3200
> +  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE
> DramOdtRttParkForDataRateLe1866;                ///< 152     DRAM ODT
> (RTT_PARK) for data rate <= 1866
> +  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE
> DramOdtRttParkForDataRateLe2400;                ///< 153     DRAM ODT
> (RTT_PARK) for data rate <= 2400
> +  SPD4_LRDIMM_DRAM_ODT_RTT_PARK_FOR_DATA_RATE
> DramOdtRttParkForDataRateLe3200;                ///< 154     DRAM ODT
> (RTT_PARK) for data rate <= 3200
> +  SPD4_LRDIMM_DATA_BUFFER_VREFDQ_FOR_DRAM_INTERFACE_RANGE
> DataBufferVrefDQForDramInterfaceRange;          ///< 155     Data Buffer
> VrefDQ for DRAM Interface Range
> +  SPD4_LRDIMM_DATA_BUFFER_DQ_DECISION_FEEDBACK_EQUALIZATION
> DataBufferDqDecisionFeedbackEqualization;       ///< 156     Data Buffer DQ
> Decision Feedback Equalization
> +  UINT8                                                               Reserved[253 - 157 + 1];
> ///< 253-132 Reserved
> +  SPD4_CYCLIC_REDUNDANCY_CODE                                         Crc;
> ///< 254-255 Cyclical Redundancy Code (CRC)
> +} SPD4_MODULE_LOADREDUCED;
> +
> +typedef struct {
> +  UINT8                                                      Reserved0[191 - 128 + 1];              ///< 128-
> 191  Reserved
> +  SPD4_NVDIMM_MODULE_PRODUCT_IDENTIFIER
> ModuleProductIdentifier;               ///< 192-193  Module Product Identifier
> +  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_MANUFACTURER_ID_CODE
> SubsystemControllerManufacturerIdCode; ///< 194-195  Subsystem
> Controller Manufacturer's ID Code
> +  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_IDENTIFIER
> SubsystemControllerIdentifier;         ///< 196-197  Subsystem Controller
> Identifier
> +  SPD4_NVDIMM_SUBSYSTEM_CONTROLLER_REVISION_CODE
> SubsystemControllerRevisionCode;       ///< 198      Subsystem Controller
> Revision Code
> +  SPD4_NVDIMM_REFERENCE_RAW_CARD
> ReferenceRawCardUsed;                  ///< 199      Reference Raw Card Used
> +  SPD4_NVDIMM_MODULE_CHARACTERISTICS
> ModuleCharacteristics;                 ///< 200      Module Characteristics
> +  SPD4_NVDIMM_HYBRID_MODULE_MEDIA_TYPES
> HybridModuleMediaTypes;                ///< 201-202  Hybrid Module Media Types
> +
> SPD4_NVDIMM_MAXIMUM_NONVOLATILE_MEMORY_INITIALIZATION_TI
> ME MaximumNonVolatileMemoryInitializationTime; ///< 203 Maximum Non-
> Volatile Memory Initialization Time
> +  SPD4_NVDIMM_FUNCTION_INTERFACE_DESCRIPTOR
> FunctionInterfaceDescriptors[8];       ///< 204-219  Function Interface
> Descriptors
> +  UINT8                                                      Reserved[253 - 220 + 1];               ///< 220-
> 253  Reserved
> +  SPD4_CYCLIC_REDUNDANCY_CODE                                Crc;
> ///< 254-255  Cyclical Redundancy Code (CRC)
> +} SPD4_MODULE_NVDIMM;
> +
> +typedef union {
> +  SPD4_MODULE_UNBUFFERED              Unbuffered;               ///< 128-255
> Unbuffered Memory Module Types
> +  SPD4_MODULE_REGISTERED              Registered;               ///< 128-255
> Registered Memory Module Types
> +  SPD4_MODULE_LOADREDUCED             LoadReduced;              ///< 128-255
> Load Reduced Memory Module Types
> +  SPD4_MODULE_NVDIMM                  NonVolatile;              ///< 128-255 Non-
> Volatile (NVDIMM-N) Hybrid Memory Parameters
> +} SPD4_MODULE_SPECIFIC;
> +
> +typedef struct {
> +  UINT8                               ModulePartNumber[348 - 329 + 1]; ///< 329-348
> Module Part Number
> +} SPD4_MODULE_PART_NUMBER;
> +
> +typedef struct {
> +  UINT8                               ManufacturerSpecificData[381 - 353 + 1]; ///< 353-
> 381 Manufacturer's Specific Data
> +} SPD4_MANUFACTURER_SPECIFIC;
> +
> +typedef UINT8                         SPD4_MODULE_REVISION_CODE;///< 349
> Module Revision Code
> +typedef UINT8                         SPD4_DRAM_STEPPING;       ///< 352     Dram
> Stepping
> +
> +typedef struct {
> +  SPD4_UNIQUE_MODULE_ID               ModuleId;                 ///< 320-328
> Unique Module ID
> +  SPD4_MODULE_PART_NUMBER             ModulePartNumber;         ///< 329-
> 348 Module Part Number
> +  SPD4_MODULE_REVISION_CODE           ModuleRevisionCode;       ///< 349
> Module Revision Code
> +  SPD4_MANUFACTURER_ID_CODE           DramIdCode;               ///< 350-351
> Dram Manufacturer ID Code
> +  SPD4_DRAM_STEPPING                  DramStepping;             ///< 352     Dram
> Stepping
> +  SPD4_MANUFACTURER_SPECIFIC          ManufacturerSpecificData; ///<
> 353-381 Manufacturer's Specific Data
> +  UINT8                               Reserved[2];              ///< 382-383 Reserved
> +} SPD4_MANUFACTURING_DATA;
> +
> +typedef struct {
> +  UINT8                               Reserved[511 - 384 + 1];  ///< 384-511 Unbuffered
> Memory Module Types
> +} SPD4_END_USER_SECTION;
> +
> +///
> +/// DDR4 Serial Presence Detect structure
> +///
> +typedef struct {
> +  SPD4_BASE_SECTION                   Base;                     ///< 0-127   Base
> Configuration and DRAM Parameters
> +  SPD4_MODULE_SPECIFIC                Module;                   ///< 128-255 Module-
> Specific Section
> +  UINT8                               Reserved[319 - 256 + 1];  ///< 256-319 Reserved
> +  SPD4_MANUFACTURING_DATA             ManufactureInfo;          ///< 320-383
> Manufacturing Information
> +  SPD4_END_USER_SECTION               EndUser;                  ///< 384-511 End User
> Programmable
> +} SPD_DDR4;
> +
> +#pragma pack (pop)
> +#endif
> diff --git a/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
> b/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
> new file mode 100644
> index 0000000..46ee68b
> --- /dev/null
> +++ b/MdePkg/Include/IndustryStandard/SdramSpdLpDdr.h
> @@ -0,0 +1,474 @@
> +/** @file
> +  This file contains definitions for SPD LPDDR.
> +
> +  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
> +  This program and the accompanying materials
> +  are licensed and made available under the terms and conditions of the BSD
> License
> +  which accompanies this distribution.  The full text of the license may be
> found at
> +  http://opensource.org/licenses/bsd-license.php
> +
> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> +  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +
> +  @par Revision Reference:
> +    - Serial Presence Detect (SPD) for LPDDR3 and LPDDR4 SDRAM Modules
> Document Release 2
> +      http://www.jedec.org/standards-documents/docs/spd412m-2
> +**/
> +
> +#ifndef _SDRAM_SPD_LPDDR_H_
> +#define _SDRAM_SPD_LPDDR_H_
> +
> +#pragma pack (push, 1)
> +
> +typedef union {
> +  struct {
> +    UINT8  BytesUsed                           :  4; ///< Bits 3:0
> +    UINT8  BytesTotal                          :  3; ///< Bits 6:4
> +    UINT8  CrcCoverage                         :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_DEVICE_DESCRIPTION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Minor                               :  4; ///< Bits 3:0
> +    UINT8  Major                               :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_REVISION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Type                                :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_DRAM_DEVICE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ModuleType                          :  4; ///< Bits 3:0
> +    UINT8  HybridMedia                         :  3; ///< Bits 6:4
> +    UINT8  Hybrid                              :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Density                             :  4; ///< Bits 3:0
> +    UINT8  BankAddress                         :  2; ///< Bits 5:4
> +    UINT8  BankGroup                           :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SDRAM_DENSITY_BANKS_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ColumnAddress                       :  3; ///< Bits 2:0
> +    UINT8  RowAddress                          :  3; ///< Bits 5:3
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SDRAM_ADDRESSING_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SignalLoading                       :  2; ///< Bits 1:0
> +    UINT8  ChannelsPerDie                      :  2; ///< Bits 3:2
> +    UINT8  DieCount                            :  3; ///< Bits 6:4
> +    UINT8  SdramPackageType                    :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SDRAM_PACKAGE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  MaximumActivateCount                :  4; ///< Bits 3:0
> +    UINT8  MaximumActivateWindow               :  2; ///< Bits 5:4
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SDRAM_OPTIONAL_FEATURES_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SDRAM_THERMAL_REFRESH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  5; ///< Bits 4:0
> +    UINT8  SoftPPR                             :  1; ///< Bits 5:5
> +    UINT8  PostPackageRepair                   :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  OperationAt1_20                     :  1; ///< Bits 0:0
> +    UINT8  EndurantAt1_20                      :  1; ///< Bits 1:1
> +    UINT8  OperationAt1_10                     :  1; ///< Bits 2:2
> +    UINT8  EndurantAt1_10                      :  1; ///< Bits 3:3
> +    UINT8  OperationAtTBD2V                    :  1; ///< Bits 4:4
> +    UINT8  EndurantAtTBD2V                     :  1; ///< Bits 5:5
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_NOMINAL_VOLTAGE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  SdramDeviceWidth                    :  3; ///< Bits 2:0
> +    UINT8  RankCount                           :  3; ///< Bits 5:3
> +    UINT8  Reserved                            :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_ORGANIZATION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  PrimaryBusWidth                     :  3; ///< Bits 2:0
> +    UINT8  BusWidthExtension                   :  2; ///< Bits 4:3
> +    UINT8  NumberofChannels                    :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_MEMORY_BUS_WIDTH_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Reserved                            :  7; ///< Bits 6:0
> +    UINT8  ThermalSensorPresence               :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_THERMAL_SENSOR_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ExtendedBaseModuleType              :  4; ///< Bits 3:0
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_EXTENDED_MODULE_TYPE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ChipSelectLoading                   :  3; ///< Bits 2:0
> +    UINT8  CommandAddressControlClockLoading   :  3; ///< Bits 5:3
> +    UINT8  DataStrobeMaskLoading               :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_SIGNAL_LOADING_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Fine                                :  2; ///< Bits 1:0
> +    UINT8  Medium                              :  2; ///< Bits 3:2
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TIMEBASE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCKmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TCK_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tCKmax                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TCK_MAX_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT32 Cl3                                 :  1;  ///< Bits 0:0
> +    UINT32 Cl6                                 :  1;  ///< Bits 1:1
> +    UINT32 Cl8                                 :  1;  ///< Bits 2:2
> +    UINT32 Cl9                                 :  1;  ///< Bits 3:3
> +    UINT32 Cl10                                :  1;  ///< Bits 4:4
> +    UINT32 Cl11                                :  1;  ///< Bits 5:5
> +    UINT32 Cl12                                :  1;  ///< Bits 6:6
> +    UINT32 Cl14                                :  1;  ///< Bits 7:7
> +    UINT32 Cl16                                :  1;  ///< Bits 8:8
> +    UINT32 Reserved0                           :  1;  ///< Bits 9:9
> +    UINT32 Cl20                                :  1;  ///< Bits 10:10
> +    UINT32 Cl22                                :  1;  ///< Bits 11:11
> +    UINT32 Cl24                                :  1;  ///< Bits 12:12
> +    UINT32 Reserved1                           :  1;  ///< Bits 13:13
> +    UINT32 Cl28                                :  1;  ///< Bits 14:14
> +    UINT32 Reserved2                           :  1;  ///< Bits 15:15
> +    UINT32 Cl32                                :  1;  ///< Bits 16:16
> +    UINT32 Reserved3                           :  1;  ///< Bits 17:17
> +    UINT32 Cl36                                :  1;  ///< Bits 18:18
> +    UINT32 Reserved4                           :  1;  ///< Bits 19:19
> +    UINT32 Cl40                                :  1;  ///< Bits 20:20
> +    UINT32 Reserved5                           :  11; ///< Bits 31:21
> +  } Bits;
> +  UINT32 Data;
> +  UINT16 Data16[2];
> +  UINT8  Data8[4];
> +} SPD_LPDDR_CAS_LATENCIES_SUPPORTED_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tAAmin                              :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TAA_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  ReadLatencyMode                     :  2; ///< Bits 1:0
> +    UINT8  WriteLatencySet                     :  2; ///< Bits 3:2
> +    UINT8  Reserved                            :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_RW_LATENCY_OPTION_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRCDmin                             :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TRCD_MIN_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRPab                               :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TRP_AB_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  tRPpb                               :  8; ///< Bits 7:0
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_TRP_PB_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT16  tRFCab                             :  16; ///< Bits 15:0
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD_LPDDR_TRFC_AB_MTB_STRUCT;
> +
> +typedef union {
> +struct {
> +    UINT16  tRFCpb                             :  16; ///< Bits 15:0
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD_LPDDR_TRFC_PB_MTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT8  BitOrderatSDRAM                     :  5; ///< Bits 4:0
> +    UINT8  WiredtoUpperLowerNibble             :  1; ///< Bits 5:5
> +    UINT8  PackageRankMap                      :  2; ///< Bits 7:6
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_CONNECTOR_BIT_MAPPING_BYTE_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRPpbFine                            :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TRP_PB_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRPabFine                            :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TRP_AB_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tRCDminFine                          :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TRCD_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tAAminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TAA_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCKmaxFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TCK_MAX_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    INT8  tCKminFine                           :  8; ///< Bits 7:0
> +  } Bits;
> +  INT8  Data;
> +} SPD_LPDDR_TCK_MIN_FTB_STRUCT;
> +
> +typedef union {
> +  struct {
> +    UINT16 ContinuationCount                   :  7; ///< Bits 6:0
> +    UINT16 ContinuationParity                  :  1; ///< Bits 7:7
> +    UINT16 LastNonZeroByte                     :  8; ///< Bits 15:8
> +  } Bits;
> +  UINT16 Data;
> +  UINT8  Data8[2];
> +} SPD_LPDDR_MANUFACTURER_ID_CODE;
> +
> +typedef struct {
> +  UINT8 Location;                              ///< Module Manufacturing Location
> +} SPD_LPDDR_MANUFACTURING_LOCATION;
> +
> +typedef struct {
> +  UINT8  Year;                                 ///< Year represented in BCD (00h = 2000)
> +  UINT8  Week;                                 ///< Year represented in BCD (47h = week
> 47)
> +} SPD_LPDDR_MANUFACTURING_DATE;
> +
> +typedef union {
> +  UINT32 Data;
> +  UINT16 SerialNumber16[2];
> +  UINT8  SerialNumber8[4];
> +} SPD_LPDDR_MANUFACTURER_SERIAL_NUMBER;
> +
> +typedef struct {
> +  SPD_LPDDR_MANUFACTURER_ID_CODE            IdCode;                   ///<
> Module Manufacturer ID Code
> +  SPD_LPDDR_MANUFACTURING_LOCATION          Location;                 ///<
> Module Manufacturing Location
> +  SPD_LPDDR_MANUFACTURING_DATE              Date;                     ///< Module
> Manufacturing Year, in BCD (range: 2000-2255)
> +  SPD_LPDDR_MANUFACTURER_SERIAL_NUMBER      SerialNumber;
> ///< Module Serial Number
> +} SPD_LPDDR_UNIQUE_MODULE_ID;
> +
> +typedef union {
> +  struct {
> +    UINT8  FrontThickness                      :  4; ///< Bits 3:0
> +    UINT8  BackThickness                       :  4; ///< Bits 7:4
> +  } Bits;
> +  UINT8 Data;
> +} SPD_LPDDR_MODULE_MAXIMUM_THICKNESS;
> +
> +typedef union {
> +  struct {
> +    UINT8  Height                              :  5; ///< Bits 4:0
> +    UINT8  RawCardExtension                    :  3; ///< Bits 7:5
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_MODULE_NOMINAL_HEIGHT;
> +
> +typedef union {
> +  struct {
> +    UINT8  Card                                :  5; ///< Bits 4:0
> +    UINT8  Revision                            :  2; ///< Bits 6:5
> +    UINT8  Extension                           :  1; ///< Bits 7:7
> +  } Bits;
> +  UINT8  Data;
> +} SPD_LPDDR_REFERENCE_RAW_CARD;
> +
> +typedef union {
> +  UINT16 Crc[1];
> +  UINT8  Data8[2];
> +} SPD_LPDDR_CYCLIC_REDUNDANCY_CODE;
> +
> +typedef struct {
> +  SPD_LPDDR_DEVICE_DESCRIPTION_STRUCT            Description;              ///< 0
> Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage 1, 2
> +  SPD_LPDDR_REVISION_STRUCT                      Revision;                 ///< 1       SPD
> Revision
> +  SPD_LPDDR_DRAM_DEVICE_TYPE_STRUCT              DramDeviceType;
> ///< 2       DRAM Device Type
> +  SPD_LPDDR_MODULE_TYPE_STRUCT                   ModuleType;               ///< 3
> Module Type
> +  SPD_LPDDR_SDRAM_DENSITY_BANKS_STRUCT
> SdramDensityAndBanks;     ///< 4       SDRAM Density and Banks
> +  SPD_LPDDR_SDRAM_ADDRESSING_STRUCT              SdramAddressing;
> ///< 5       SDRAM Addressing
> +  SPD_LPDDR_SDRAM_PACKAGE_TYPE_STRUCT            SdramPackageType;
> ///< 6       SDRAM Package Type
> +  SPD_LPDDR_SDRAM_OPTIONAL_FEATURES_STRUCT
> SdramOptionalFeatures;    ///< 7       SDRAM Optional Features
> +  SPD_LPDDR_SDRAM_THERMAL_REFRESH_STRUCT
> ThermalAndRefreshOptions; ///< 8       SDRAM Thermal and Refresh Options
> +  SPD_LPDDR_OTHER_SDRAM_OPTIONAL_FEATURES_STRUCT
> OtherOptionalFeatures;    ///< 9      Other SDRAM Optional Features
> +  UINT8                                          Reserved0;                ///< 10      Reserved
> +  SPD_LPDDR_MODULE_NOMINAL_VOLTAGE_STRUCT
> ModuleNominalVoltage;     ///< 11      Module Nominal Voltage, VDD
> +  SPD_LPDDR_MODULE_ORGANIZATION_STRUCT
> ModuleOrganization;       ///< 12      Module Organization
> +  SPD_LPDDR_MODULE_MEMORY_BUS_WIDTH_STRUCT
> ModuleMemoryBusWidth;     ///< 13      Module Memory Bus Width
> +  SPD_LPDDR_MODULE_THERMAL_SENSOR_STRUCT
> ModuleThermalSensor;      ///< 14      Module Thermal Sensor
> +  SPD_LPDDR_EXTENDED_MODULE_TYPE_STRUCT
> ExtendedModuleType;       ///< 15      Extended Module Type
> +  SPD_LPDDR_SIGNAL_LOADING_STRUCT                SignalLoading;            ///<
> 16      Signal Loading
> +  SPD_LPDDR_TIMEBASE_STRUCT                      Timebase;                 ///< 17
> Timebases
> +  SPD_LPDDR_TCK_MIN_MTB_STRUCT                   tCKmin;                   ///< 18
> SDRAM Minimum Cycle Time (tCKmin)
> +  SPD_LPDDR_TCK_MAX_MTB_STRUCT                   tCKmax;                   ///< 19
> SDRAM Maximum Cycle Time (tCKmax)
> +  SPD_LPDDR_CAS_LATENCIES_SUPPORTED_STRUCT       CasLatencies;
> ///< 20-23   CAS Latencies Supported
> +  SPD_LPDDR_TAA_MIN_MTB_STRUCT                   tAAmin;                   ///< 24
> Minimum CAS Latency Time (tAAmin)
> +  SPD_LPDDR_RW_LATENCY_OPTION_STRUCT             LatencySetOptions;
> ///< 25      Read and Write Latency Set Options
> +  SPD_LPDDR_TRCD_MIN_MTB_STRUCT                  tRCDmin;                  ///< 26
> Minimum RAS# to CAS# Delay Time (tRCDmin)
> +  SPD_LPDDR_TRP_AB_MTB_STRUCT                    tRPab;                    ///< 27
> Minimum Row Precharge Delay Time (tRPab), all banks
> +  SPD_LPDDR_TRP_PB_MTB_STRUCT                    tRPpb;                    ///< 28
> Minimum Row Precharge Delay Time (tRPpb), per bank
> +  SPD_LPDDR_TRFC_AB_MTB_STRUCT                   tRFCab;                   ///< 29-30
> Minimum Refresh Recovery Delay Time (tRFCab), all banks
> +  SPD_LPDDR_TRFC_PB_MTB_STRUCT                   tRFCpb;                   ///< 31-32
> Minimum Refresh Recovery Delay Time (tRFCpb), per bank
> +  UINT8                                          Reserved1[59 - 33 + 1];   ///< 33-59   Reserved
> +  SPD_LPDDR_CONNECTOR_BIT_MAPPING_BYTE_STRUCT    BitMapping[77 -
> 60 + 1];  ///< 60-77   Connector to SDRAM Bit Mapping
> +  UINT8                                          Reserved2[119 - 78 + 1];  ///< 78-119  Reserved
> +  SPD_LPDDR_TRP_PB_FTB_STRUCT                    tRPpbFine;                ///< 120
> Fine Offset for Minimum Row Precharge Delay Time (tRPpbFine), per bank
> +  SPD_LPDDR_TRP_AB_FTB_STRUCT                    tRPabFine;                ///< 121
> Fine Offset for Minimum Row Precharge Delay Time (tRPabFine), all ranks
> +  SPD_LPDDR_TRCD_MIN_FTB_STRUCT                  tRCDminFine;              ///<
> 122     Fine Offset for Minimum RAS# to CAS# Delay Time (tRCDmin)
> +  SPD_LPDDR_TAA_MIN_FTB_STRUCT                   tAAminFine;               ///< 123
> Fine Offset for Minimum CAS Latency Time (tAAmin)
> +  SPD_LPDDR_TCK_MAX_FTB_STRUCT                   tCKmaxFine;               ///< 124
> Fine Offset for SDRAM Maximum Cycle Time (tCKmax)
> +  SPD_LPDDR_TCK_MIN_FTB_STRUCT                   tCKminFine;               ///< 125
> Fine Offset for SDRAM Minimum Cycle Time (tCKmin)
> +  SPD_LPDDR_CYCLIC_REDUNDANCY_CODE               Crc;                      ///< 126-
> 127 Cyclical Redundancy Code (CRC)
> +} SPD_LPDDR_BASE_SECTION;
> +
> +typedef struct {
> +  SPD_LPDDR_MODULE_NOMINAL_HEIGHT         ModuleNominalHeight;
> ///< 128     Module Nominal Height
> +  SPD_LPDDR_MODULE_MAXIMUM_THICKNESS
> ModuleMaximumThickness;   ///< 129     Module Maximum Thickness
> +  SPD_LPDDR_REFERENCE_RAW_CARD            ReferenceRawCardUsed;
> ///< 130     Reference Raw Card Used
> +  UINT8                                   Reserved[253 - 131 + 1];  ///< 131-253 Reserved
> +  SPD_LPDDR_CYCLIC_REDUNDANCY_CODE        Crc;                      ///< 254-255
> Cyclical Redundancy Code (CRC)
> +} SPD_LPDDR_MODULE_LPDIMM;
> +
> +typedef struct {
> +  SPD_LPDDR_MODULE_LPDIMM                 LpDimm;                   ///< 128-255
> Unbuffered Memory Module Types
> +} SPD_LPDDR_MODULE_SPECIFIC;
> +
> +typedef struct {
> +  UINT8                                   ModulePartNumber[348 - 329 + 1]; ///< 329-348
> Module Part Number
> +} SPD_LPDDR_MODULE_PART_NUMBER;
> +
> +typedef struct {
> +  UINT8                                   ManufacturerSpecificData[381 - 353 + 1]; ///< 353-
> 381 Manufacturer's Specific Data
> +} SPD_LPDDR_MANUFACTURER_SPECIFIC;
> +
> +typedef UINT8                             SPD_LPDDR_MODULE_REVISION_CODE;///<
> 349     Module Revision Code
> +typedef UINT8                             SPD_LPDDR_DRAM_STEPPING;       ///< 352
> Dram Stepping
> +
> +typedef struct {
> +  SPD_LPDDR_UNIQUE_MODULE_ID              ModuleId;                 ///< 320-328
> Unique Module ID
> +  SPD_LPDDR_MODULE_PART_NUMBER            ModulePartNumber;         ///<
> 329-348 Module Part Number
> +  SPD_LPDDR_MODULE_REVISION_CODE          ModuleRevisionCode;       ///<
> 349     Module Revision Code
> +  SPD_LPDDR_MANUFACTURER_ID_CODE          DramIdCode;               ///<
> 350-351 Dram Manufacturer ID Code
> +  SPD_LPDDR_DRAM_STEPPING                 DramStepping;             ///< 352
> Dram Stepping
> +  SPD_LPDDR_MANUFACTURER_SPECIFIC         ManufacturerSpecificData;
> ///< 353-381 Manufacturer's Specific Data
> +  UINT8                                   Reserved[383 - 382 + 1];  ///< 382-383 Reserved
> +} SPD_LPDDR_MANUFACTURING_DATA;
> +
> +typedef struct {
> +  UINT8                                   Reserved[511 - 384 + 1];  ///< 384-511 End User
> Programmable
> +} SPD_LPDDR_END_USER_SECTION;
> +
> +///
> +/// LPDDR Serial Presence Detect structure
> +///
> +typedef struct {
> +  SPD_LPDDR_BASE_SECTION                  Base;                     ///< 0-127   Base
> Configuration and DRAM Parameters
> +  SPD_LPDDR_MODULE_SPECIFIC               Module;                   ///< 128-255
> Module-Specific Section
> +  UINT8                                   Reserved[319 - 256 + 1];  ///< 256-319 Hybrid
> Memory Parameters
> +  SPD_LPDDR_MANUFACTURING_DATA            ManufactureInfo;          ///<
> 320-383 Manufacturing Information
> +  SPD_LPDDR_END_USER_SECTION              EndUser;                  ///< 384-511
> End User Programmable
> +} SPD_LPDDR;
> +
> +#pragma pack (pop)
> +#endif
> --
> 2.8.0.windows.1



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2016-11-23  7:03 [PATCH v3] MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec Liming Gao
2016-11-23 16:18 ` Mudusuru, Giri P

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