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Texas Instruments TMS320DM643 Protocol Descriptions, DDR2 SDRAM Commands, Peripheral Architecture

Models: TMS320DM643

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2.4Protocol Description(s)

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Peripheral Architecture

2.4Protocol Description(s)

The DDR2 memory controller supports the DDR2 SDRAM commands listed in Table 3. Table 4 shows the signal truth table for the DDR2 SDRAM commands.

	Table 3. DDR2 SDRAM Commands
Command	Function
ACTV	Activates the selected bank and row.
DCAB	Precharge all command. Deactivates (precharges) all banks.
DEAC	Precharge single command. Deactivates (precharges) a single bank.
DESEL	Device Deselect.
EMRS	Extended Mode Register set. Allows altering the contents of the mode register.
MRS	Mode register set. Allows altering the contents of the mode register.
NOP	No operation.
Power Down	Power down mode.
READ	Inputs the starting column address and begins the read operation.
READ with	Inputs the starting column address and begins the read operation. The read operation is followed by a
autoprecharge	precharge.
REFR	Autorefresh cycle.
SLFREFR	Self-refresh mode.
WRT	Inputs the starting column address and begins the write operation.
WRT with	Inputs the starting column address and begins the write operation. The write operation is followed by a
autoprecharge	precharge.

Table 4. Truth Table for DDR2 SDRAM Commands

DDR2
SDRAM:	CKE		CS	RAS	CAS	WE	BA[2:0]	A[12:11, 9:0]	A10
DDR2
memory
controller:		DDR_CKE	DDR_CS	DDR_RAS	DDR_CAS	DDR_WE	DDR_BA[2:0]	DDR_A[12:11, 9:0]	DDR_A[10]
	Previous
	Cycles	Current Cycle
ACTV	H	H	L	L	H	H	Bank	Row Address
DCAB	H	H	L	L	H	L	X	X	L
DEAC	H	H	L	L	H	L	Bank	X	L
MRS	H	H	L	L	L	L	BA	OP Code
EMRS	H	H	L	L	L	L	BA	OP Code
READ	H	H	L	H	L	H	BA	Column Address	L
READ with	H	H	L	H	L	H	BA	Column Address	H
precharge
WRT	H	H	L	H	L	L	BA	Column Address	L
WRT with	H	H	L	H	L	L	BA	Column Address	L
precharge
REFR	H	H	L	L	L	H	X	X	X
SLFREFR	H	L	L	L	L	H	X	X	X
entry
SLFREFR	L	H	H	X	X	X	X	X	X
exit			L	H	H	H	X	X	X
			L	H	H	H	X	X	X
NOP	H	X	L	H	H	H	X	X	X
DESEL	H	X	H	X	X	X	X	X	X
Power Down	H	L	H	X	X	X	X	X	X
entry			L	H	H	H	X	X	X
			L	H	H	H	X	X	X
Power Down	L	H	H	X	X	X	X	X	X
exit			L	H	H	H	X	X	X
			L	H	H	H	X	X	X

12

DDR2 Memory Controller

SPRU986B–November 2007

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Texas Instruments TMS320DM643 Protocol Descriptions, Truth Table for DDR2 SDRAM Commands, Peripheral Architecture

Contents

Users Guide TMS320DM643x DMP DDR2 Memory ControllerSPRU986B-November Submit Documentation FeedbackContents List of Figures List of FiguresList of Tables Read This First PrefaceAbout This Manual Notational ConventionsDDR2 Memory Controller Users Guide1.2 Features 1 Introduction1.3 Functional Block Diagram 1.4 Supported Use Case Statement1.5 Industry Standards Compliance Statement Figure 1. Data Paths to DDR2 Memory ControllerFigure 2. DDR2 Memory Controller Clock Block Diagram 2 Peripheral Architecture2.1 Clock Control 2.1.1 Clock Source2.1.2 Clock Configuration Table 1. PLLC2 Configuration2.2 Memory Map 2.1.3 DDR2 Memory Controller Internal Clock Domains2.3 Signal Descriptions Figure 3. DDR2 Memory Controller SignalsTable 2. DDR2 Memory Controller Signal Descriptions Peripheral ArchitectureTable 3. DDR2 SDRAM Commands Table 4. Truth Table for DDR2 SDRAM Commands2.4 Protocol Descriptions Peripheral Architecture2.4.1 Refresh Mode Figure 4. Refresh CommandDDRCLK DDRCLK DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA120 DDRBA20 DDRDQM30Figure 5. DCAB Command 2.4.2 Deactivation DCAB and DEACDCAB DDRCLK DDRCLK DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA12,11 DDRA10 DDRBA20 DDRDQM30Figure 6. DEAC Command Peripheral ArchitectureDDR2 Memory Controller Submit Documentation FeedbackFigure 7. ACTV Command 2.4.3 Activation ACTVDDRA120 2.4.4 READ Command Figure 8. DDR2 READ CommandDDRCLK DDRCLK DDRCKE DDRCS DDRRAS DDRCAS DDRWE DDRA120 COL 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 Command2.5 Memory Width and Byte Alignment Table 5. Addressable Memory RangesFigure 11. Byte Alignment 2.6 Endianness Considerations Table 6. 16-Bit External MemoryTable 7. 32-Bit External Memory Table 8. Bank Configuration Register Fields for Address Mapping 2.7 Address MappingTable 9. Logical Address-to-DDR2 SDRAM Address Map for 32-Bit SDRAM Table 10. Logical Address-to-DDR2 SDRAM Address Map for 16-bit SDRAMPeripheral Architecture DDR2 Memory ControllerFigure 12. Logical Address-to-DDR2 SDRAM Address Map Peripheral ArchitectureFigure 13. DDR2 SDRAM Column, Row, and Bank Access Peripheral ArchitectureDDR2 Memory Controller Submit Documentation FeedbackFigure 14. DDR2 Memory Controller FIFO Block Diagram 2.8 DDR2 Memory Controller InterfaceTable 11. DDR2 Memory Controller FIFO Description 2.8.1 Command Ordering and Scheduling, Advanced Concept 2.8.2 Command Starvation 2.8.3 Possible Race Condition2.10 Self-Refresh Mode 2.9 Refresh SchedulingTable 12. Refresh Urgency Levels 2.11 Reset Considerations Table 13. Reset SourcesFigure 15. DDR2 Memory Controller Reset Block Diagram 2.12 VTP IO Buffer Calibration 2.13 Auto-Initialization SequenceTable 14. DDR2 SDRAM Configuration by MRS Command Table 15. DDR2 SDRAM Configuration by EMRS1 Command2.13.1 Initializing Configuration Registers Write recovery from autoprecharge. Value of2.13.2 Initializing Following Device Power Up and Device RESET 2.16 Power Management Figure 16. DDR2 Memory Controller Power Sleep Controller Diagram2.14 Interrupt Support 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 CasesFigure 17. Connecting DDR2 Memory Controller for 32-Bit Connection Figure 18. Connecting DDR2 Memory Controller for 16-Bit ConnectionSupported Use Cases 200 Ω 200 Ω3.2.1 Configuring SDRAM Bank Configuration Register SDBCR Table 16. SDRAM Bank Configuration Register SDBCR Configuration3.2.2 Configuring SDRAM Refresh Control Register SDRCR Table 17. DDR2 Memory Refresh Specification3.2.3 Configuring SDRAM Timing Registers SDTIMR and SDTIMR2 Table 19. SDRAM Timing Register SDTIMR ConfigurationTable 20. SDRAM Timing Register 2 SDTIMR2 Configuration 3.2.4 Configuring DDR PHY Control Register DDRPHYCR Table 21. DDR PHY Control Register DDRPHYCR Configuration4 DDR2 Memory Controller Registers 4.1 SDRAM Status Register SDRSTAT Figure 19. SDRAM Status Register SDRSTATTable 25. SDRAM Status Register SDRSTAT Field Descriptions 4.2 SDRAM Bank Configuration Register SDBCR Figure 20. SDRAM Bank Configuration Register SDBCRTable 26. SDRAM Bank Configuration Register SDBCR Field Descriptions DDR2 Memory Controller RegistersDDR2 Memory Controller Registers DDR2 Memory ControllerSubmit Documentation Feedback 4.3 SDRAM Refresh Control Register SDRCR Figure 21. SDRAM Refresh Control Register SDRCRTable 27. SDRAM Refresh Control Register SDRCR Field Descriptions DDR2 Memory Controller Registers4.4 SDRAM Timing Register SDTIMR Figure 22. SDRAM Timing Register SDTIMRTable 28. SDRAM Timing Register SDTIMR Field Descriptions DDR2 Memory Controller Registers4.5 SDRAM Timing Register 2 SDTIMR2 Figure 23. SDRAM Timing Register 2 SDTIMR2Table 29. SDRAM Timing Register 2 SDTIMR2 Field Descriptions DDR2 Memory Controller Registers4.6 Peripheral Bus Burst Priority Register PBBPR Figure 24. Peripheral Bus Burst Priority Register PBBPR4.7 Interrupt Raw Register IRR Figure 25. Interrupt Raw Register IRRTable 31. Interrupt Raw Register IRR Field Descriptions DDR2 Memory Controller Registers4.8 Interrupt Masked Register IMR Figure 26. Interrupt Masked Register IMRTable 32. Interrupt Masked Register IMR Field Descriptions 4.9 Interrupt Mask Set Register IMSR Figure 27. Interrupt Mask Set Register IMSRTable 33. Interrupt Mask Set Register IMSR Field Descriptions DDR2 Memory Controller Registers4.10 Interrupt Mask Clear Register IMCR Figure 28. Interrupt Mask Clear Register IMCRTable 34. Interrupt Mask Clear Register IMCR Field Descriptions DDR2 Memory Controller Registers4.11 DDR PHY Control Register DDRPHYCR Figure 29. DDR PHY Control Register DDRPHYCRTable 35. DDR PHY Control Register DDRPHYCR Field Descriptions DDR2 Memory Controller Registers4.12 VTP IO Control Register VTPIOCR Figure 30. VTP IO Control Register VTPIOCRTable 36. VTP IO Control Register VTPIOCR Field Descriptions DDR2 Memory Controller Registers4.14 DDR VTP Enable Register DDRVTPER Figure 32. DDR VTP Enable Register DDRVTPERTable 38. DDR VTP Enable Register DDRVTPER Field Descriptions 4.13 DDR VTP Register DDRVTPRAppendix A Revision History Table A-1. Document Revision HistoryAppendix A Sectionpower.ti.com IMPORTANT NOTICEProducts Applications