Texas Instruments TMS320DM647, DM648 DSP specification

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Using the DDR2 Memory Controller

Figure 19. Connecting to Two 8-Bit DDR2 SDRAM Devices

DDR_CLK

DDR_CLK

DDR2 DDR_CKE memory DDR_CS

controller DDR_WE DDR_RAS DDR_CAS DDR_DQM0 DDR_DQS0 DDR_DQS0

DDR_BA[2:0]

DDR_A[13:0]

DDR_D[7:0]

DDR_DQM1

DDR_DQS1

DDR_DQS1

DDR_D[15:8]

DDR_ODT0

DDR_ODT1

DDR_VREF

DDR_DQGATE0(A)

DDR_DQGATE1(A)

DDR_DQGATE2(A)

DDR_DQGATE3(A)

VREF

CK

CK

CKE

CS

WE

RAS DDR2

CAS memory x8−bit

DM

DQS

DQS

RDQS

RDQS

BA[2:0]

A[13:0]

DQ[7:0]

ODT

VREF

CK

CK

CKE

CS

WE

RAS DDR2

CAS memory x8−bit

DM

DQS

DQS

RDQS

RDQS

BA[2:0]

A[13:0]

DQ[7:0]

ODT

VREF

AThese pins are used as a timing reference during memory reads. For routing rules, see the device-specific data manual.

32	DSP DDR2 Memory Controller	SPRUEK5A –October 2007
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Texas Instruments TMS320DM647, DM648 DSP manual Connecting to Two 8-Bit DDR2 Sdram Devices

Contents

Users Guide Submit Documentation Feedback Contents List of Figures List of Tables Read This First Related Documentation From Texas Instruments Trademarks Purpose of the Peripheral FeaturesFunctional Block Diagram Industry Standards Compliance Statement Memory Map Signal DescriptionsClock Control DDR2 Memory Controller Signal Descriptions Pin Description DDR2 Sdram Commands Truth Table for DDR2 Sdram CommandsCommand Function Protocol Descriptions Mode Register Set MRS and Emrs Refresh ModeDdrclk MRS/EMRS Ddrcke Ddrcs Ddrras Ddrcas Ddrwe COL Activation Actv Ddrcs Ddrras Ddrcas Ddrwe Dcab Command Deactivation Dcab and Deac Read Command DDR2 Read Command Write WRT Command Memory Width and Byte AlignmentAddressable Memory Ranges Memory Width Maximum Addressable Bytes Bank Configuration Register Fields for Address Mapping Address MappingBit Field Bit Value Bit Description Ibank Logical Address-to-DDR2 Sdram Address Map for 16-bit Sdram Logical Address-to-DDR2 Sdram Address Map DDR2 Memory Controller Interface DDR2 Memory Controller Fifo Description DDR2 Memory Controller Fifo Block Diagram Command Ordering and Scheduling, Advanced Concept Command Starvation Refresh Scheduling Possible Race ConditionRefresh Urgency Levels Urgency Level Description Reset Sources Self-Refresh ModeReset Considerations 11.1 DDR2 Sdram Device Mode Register Configuration Values DDR2 Sdram Mode Register ConfigurationDDR2 Sdram Extended Mode Register 1 Configuration 11 DDR2 Sdram Memory Initialization 11.2 DDR2 Sdram Initialization After Reset 11.3 DDR2 Sdram Initialization After Register ConfigurationInterrupt Support Edma Event Support Using the DDR2 Memory Controller Connecting the DDR2 Memory Controller to DDR2 Sdram Connecting to Two 16-Bit DDR2 Sdram Devices Connecting to a Single 16-Bit DDR2 Sdram Device Connecting to Two 8-Bit DDR2 Sdram Devices Programming the Sdram Configuration Register Sdcfg Sdcfg ConfigurationProgramming the Sdram Refresh Control Register Sdrfc Function Selection DDR2 Memory Refresh Specification Sdrfc ConfigurationConfiguring Sdram Timing Registers SDTIM1 and SDTIM2 SDTIM1 Configuration SDTIM2 Configuration Dmcctl ConfigurationDDR2 Sdram Data Register Field Sheet Parameter Name Description DDR2 Memory Controller Registers Offset Acronym Register Description Module ID and Revision Register Midr DDR2 Memory Controller Status Register DmcstatModule ID and Revision Register Midr Field Descriptions Bit Field Value Description Sdram Configuration Register Sdcfg Sdram Configuration Register Sdcfg Field Descriptions Sdram Configuration Register Sdcfg Field Descriptions Sdram Refresh Control Register Sdrfc Sdram Refresh Control Register Sdrfc Field Descriptions Sdram Timing 1 Register SDTIM1 Sdram Timing 1 Register SDTIM1 Field DescriptionsTrfc TRP Trcd TWR Tras TRC Trrd DDR2 memory data sheet. Calculate using this formula Sdram Timing 2 Register SDTIM2 Sdram Timing 2 Register SDTIM2 Field DescriptionsTodt Tsxnr Tsxrd Trtp Tcke Prioraise Burst Priority Register BprioBurst Priority Register Bprio Field Descriptions DDR2 Memory Controller Control Register Dmcctl Rese Table A-1. Document Revision History Additions/Modifications/Deletions Rfid Products ApplicationsDSP