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Texas Instruments TMS320DM643 manual Deactivation DCAB and DEAC, DCAB Command, DDRBA20 DDRDQM30

Models: TMS320DM643

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Peripheral Architecture

2.4.2Deactivation (DCAB and DEAC)

The precharge all banks command (DCAB) is performed after a reset to the DDR2 memory controller or following the initialization sequence. DDR2 SDRAMs also require this cycle prior to a refresh (REFR) and mode set register commands (MRS and EMRS). During a DCAB command, DDR_A[10] is driven high to ensure the deactivation of all banks. Figure 5 shows the timing diagram for a DCAB command.

Figure 5. DCAB Command

DCAB

DDR_CLK

DDR_CKE

DDR_CS

DDR_RAS

DDR_CAS

DDR_WE

DDR_A[12,11, 9:0]

DDR_A[10]

DDR_BA[2:0]

DDR_DQM[3:0]

DDR2 Memory Controller

SPRU986B–November 2007

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Texas Instruments TMS320DM643 manual Deactivation DCAB and DEAC, DCAB Command, DDRBA20 DDRDQM30

Contents

Users Guide TMS320DM643x DMP DDR2 Memory ControllerSPRU986B-November Submit Documentation FeedbackContents List of Figures List of FiguresList of Tables About This Manual Read This FirstPreface Notational Conventions1.2 Features DDR2 Memory ControllerUsers Guide 1 Introduction1.5 Industry Standards Compliance Statement 1.3 Functional Block Diagram1.4 Supported Use Case Statement Figure 1. Data Paths to DDR2 Memory Controller2.1 Clock Control Figure 2. DDR2 Memory Controller Clock Block Diagram2 Peripheral Architecture 2.1.1 Clock Source2.2 Memory Map 2.1.2 Clock ConfigurationTable 1. PLLC2 Configuration 2.1.3 DDR2 Memory Controller Internal Clock DomainsTable 2. DDR2 Memory Controller Signal Descriptions 2.3 Signal DescriptionsFigure 3. DDR2 Memory Controller Signals Peripheral Architecture2.4 Protocol Descriptions Table 3. DDR2 SDRAM CommandsTable 4. Truth Table for DDR2 SDRAM Commands Peripheral ArchitectureDDRCLK DDRCLK 2.4.1 Refresh ModeFigure 4. Refresh Command DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA120 DDRBA20 DDRDQM30DCAB DDRCLK DDRCLK DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA12,11 DDRA10 Figure 5. DCAB Command2.4.2 Deactivation DCAB and DEAC DDRBA20 DDRDQM30DDR2 Memory Controller Figure 6. DEAC CommandPeripheral Architecture Submit Documentation FeedbackDDRA120 Figure 7. ACTV Command2.4.3 Activation ACTV DDRCLK DDRCLK DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA120 COL 2.4.4 READ CommandFigure 8. DDR2 READ Command DDRBA20 BANK DDRA10 DDRDQM30 CAS Latency2.4.5 Write WRT Command Figure 9. DDR2 WRT Command2.4.6 Mode Register Set MRS and EMRS Figure 10. DDR2 MRS and EMRS CommandFigure 11. Byte Alignment 2.5 Memory Width and Byte AlignmentTable 5. Addressable Memory Ranges Table 7. 32-Bit External Memory 2.6 Endianness ConsiderationsTable 6. 16-Bit External Memory Table 8. Bank Configuration Register Fields for Address Mapping 2.7 Address MappingPeripheral Architecture Table 9. Logical Address-to-DDR2 SDRAM Address Map for 32-Bit SDRAMTable 10. Logical Address-to-DDR2 SDRAM Address Map for 16-bit SDRAM DDR2 Memory ControllerFigure 12. Logical Address-to-DDR2 SDRAM Address Map Peripheral ArchitectureDDR2 Memory Controller Figure 13. DDR2 SDRAM Column, Row, and Bank AccessPeripheral Architecture Submit Documentation FeedbackTable 11. DDR2 Memory Controller FIFO Description Figure 14. DDR2 Memory Controller FIFO Block Diagram2.8 DDR2 Memory Controller Interface 2.8.1 Command Ordering and Scheduling, Advanced Concept 2.8.2 Command Starvation 2.8.3 Possible Race ConditionTable 12. Refresh Urgency Levels 2.10 Self-Refresh Mode2.9 Refresh Scheduling Figure 15. DDR2 Memory Controller Reset Block Diagram 2.11 Reset ConsiderationsTable 13. Reset Sources 2.12 VTP IO Buffer Calibration 2.13 Auto-Initialization Sequence2.13.1 Initializing Configuration Registers Table 14. DDR2 SDRAM Configuration by MRS CommandTable 15. DDR2 SDRAM Configuration by EMRS1 Command Write recovery from autoprecharge. Value of2.13.2 Initializing Following Device Power Up and Device RESET 2.14 Interrupt Support 2.16 Power ManagementFigure 16. DDR2 Memory Controller Power Sleep Controller Diagram 2.15 DMA Event Support2.16.1 DDR2 Memory Controller Clock Stop Procedure 2.17 Emulation Considerations3.1 Connecting the DDR2 Memory Controller to DDR2 Memory 3 Supported Use CasesSupported Use Cases Figure 17. Connecting DDR2 Memory Controller for 32-Bit ConnectionFigure 18. Connecting DDR2 Memory Controller for 16-Bit Connection 200 Ω 200 Ω3.2.2 Configuring SDRAM Refresh Control Register SDRCR 3.2.1 Configuring SDRAM Bank Configuration Register SDBCRTable 16. SDRAM Bank Configuration Register SDBCR Configuration Table 17. DDR2 Memory Refresh SpecificationTable 20. SDRAM Timing Register 2 SDTIMR2 Configuration 3.2.3 Configuring SDRAM Timing Registers SDTIMR and SDTIMR2Table 19. SDRAM Timing Register SDTIMR Configuration 4 DDR2 Memory Controller Registers 3.2.4 Configuring DDR PHY Control Register DDRPHYCRTable 21. DDR PHY Control Register DDRPHYCR Configuration Table 25. SDRAM Status Register SDRSTAT Field Descriptions 4.1 SDRAM Status Register SDRSTATFigure 19. SDRAM Status Register SDRSTAT Table 26. SDRAM Bank Configuration Register SDBCR Field Descriptions 4.2 SDRAM Bank Configuration Register SDBCRFigure 20. SDRAM Bank Configuration Register SDBCR DDR2 Memory Controller RegistersSubmit Documentation Feedback DDR2 Memory Controller RegistersDDR2 Memory Controller Table 27. SDRAM Refresh Control Register SDRCR Field Descriptions 4.3 SDRAM Refresh Control Register SDRCRFigure 21. SDRAM Refresh Control Register SDRCR DDR2 Memory Controller RegistersTable 28. SDRAM Timing Register SDTIMR Field Descriptions 4.4 SDRAM Timing Register SDTIMRFigure 22. SDRAM Timing Register SDTIMR DDR2 Memory Controller RegistersTable 29. SDRAM Timing Register 2 SDTIMR2 Field Descriptions 4.5 SDRAM Timing Register 2 SDTIMR2Figure 23. SDRAM Timing Register 2 SDTIMR2 DDR2 Memory Controller Registers4.6 Peripheral Bus Burst Priority Register PBBPR Figure 24. Peripheral Bus Burst Priority Register PBBPRTable 31. Interrupt Raw Register IRR Field Descriptions 4.7 Interrupt Raw Register IRRFigure 25. Interrupt Raw Register IRR DDR2 Memory Controller RegistersTable 32. Interrupt Masked Register IMR Field Descriptions 4.8 Interrupt Masked Register IMRFigure 26. Interrupt Masked Register IMR Table 33. Interrupt Mask Set Register IMSR Field Descriptions 4.9 Interrupt Mask Set Register IMSRFigure 27. Interrupt Mask Set Register IMSR DDR2 Memory Controller RegistersTable 34. Interrupt Mask Clear Register IMCR Field Descriptions 4.10 Interrupt Mask Clear Register IMCRFigure 28. Interrupt Mask Clear Register IMCR DDR2 Memory Controller RegistersTable 35. DDR PHY Control Register DDRPHYCR Field Descriptions 4.11 DDR PHY Control Register DDRPHYCRFigure 29. DDR PHY Control Register DDRPHYCR DDR2 Memory Controller RegistersTable 36. VTP IO Control Register VTPIOCR Field Descriptions 4.12 VTP IO Control Register VTPIOCRFigure 30. VTP IO Control Register VTPIOCR DDR2 Memory Controller RegistersTable 38. DDR VTP Enable Register DDRVTPER Field Descriptions 4.14 DDR VTP Enable Register DDRVTPERFigure 32. DDR VTP Enable Register DDRVTPER 4.13 DDR VTP Register DDRVTPRAppendix A Appendix A Revision HistoryTable A-1. Document Revision History SectionProducts power.ti.comIMPORTANT NOTICE Applications