path: root/MdePkg/Include/IndustryStandard/SdramSpdDdr3.h

/** @file
  This file contains definitions for SPD DDR3.

  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

  @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