MMC Data Response Register Mmcdrsp | Texas Instruments TMS320DM644x

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Registers

4.16 MMC Data Response Register (MMCDRSP)

After the MMC controller sends a data block to a memory card, the return byte from the memory card is stored in the MMC data response register (MMCDRSP).

The MMC data response register (MMCDRSP) is shown in Figure 37 and described in Table 23.

Figure 37. MMC Data Response Register (MMCDRSP)

31			16
	Reserved
		R-0
15	8	7	0
	Reserved		DRSP
	R-0		R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 23. MMC Data Response Register (MMCDRSP) Field Descriptions

Bit	Field	Value	Description
31-8	Reserved	0	Reserved
7-0	DRSP	0-FFh	During a write operation (see Section 2.3.1), the CRC status token is stored in DRSP.

4.17 MMC Command Index Register (MMCCIDX)

The MMC command index register (MMCCIDX) stores the first byte of a response from a memory card. Table 21 and Table 22 show the format for each type of response.

The MMC command index register (MMCCIDX) is shown in Figure 38 and described in Table 24.

Figure 38. MMC Command Index Register (MMCCIDX)

31					16
	Reserved
		R-0
15	8	7	6	5	0
Reserved		STRT	XMIT		CIDX
R-0		R/W-0	R/W-0		R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 24. MMC Command Index Register (MMCCIDX) Field Descriptions

Bit	Field	Value	Description
31-8	Reserved	0	Reserved
7	STRT	0-1	Start bit. When the MMC controller receives a response, the start bit is stored in STRT.
6	XMIT	0-1	Transmission bit. When the MMC controller receives a response, the transmission bit is stored in XMIT.
5-0	CIDX	0-3Fh	Command index. When the MMC controller receives a response, the command index is stored in CIDX.

SPRUE30B –September 2006	Multimedia Card (MMC)/Secure Digital (SD) Card Controller	57
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Texas Instruments TMS320DM644x manual MMC Data Response Register Mmcdrsp, MMC Command Index Register Mmccidx

Contents

Users Guide Submit Documentation Feedback Contents Appendix a List of Figures List of Tables Read This First Trademarks Features Functional Block DiagramPurpose of the Peripheral Industry Standards Compliance Statement Supported Use Case Statement MMC/SD Controller Interface Diagram Clock Control MMC/SD Controller Clocking Diagram MMC/SD Controller Pins Used in Each Mode Signal Descriptions1 MMC/SD Mode Write Sequence Protocol Descriptions MMC/SD Mode Write Sequence 2 MMC/SD Mode Read SequencePortion Sequence Description Data Flow in the Input/Output Fifo MMC/SD Mode Read SequenceCRC RD CMD Fifo Operation Diagram 1st 2nd 3rd 4th Mmcdrr or Mmcdxr registers Support byten = Data Flow in the Data Registers Mmcdrr and Mmcdxr 1st 2nd 3rd 4th Support byten = 1111 1110 Fifo Operation During Card Read Operation Edma ReadsCPU Reads Fifo Operation During Card Read Diagram Fifo Operation During Card Write Operation Edma WritesCPU Writes Fifo Operation During Card Write Diagram Initialization Reset Considerations Initialize the Interrupt Mask Register Mmcim Initializing the Clock Controller Registers MmcclkInitialize the Time-Out Registers Mmctor and Mmctod Initialize the Data Block Registers Mmcblen and Mmcnblk Determining Whether New Data is Available in Mmcdrr Monitoring Activity in the MMC/SD Mode Checking For a Data Transmit Empty Condition Interrupt Events and Requests Interrupt SupportInterrupt Multiplexing Description of MMC/SD Interrupt Requests Power Management DMA Event SupportEmulation Considerations Card Identification Operation MMC Card Identification Procedure Procedures for Common Operations SD Card Identification Procedure MMC/SD Mode Single-Block Write Operation Using CPU MMC/SD Mode Single-Block Write Operation MMC/SD Mode Single-Block Read Operation Using the CPU MMC/SD Mode Single-Block Write Operation Using the Edma MMC/SD Mode Single-Block Read Operation MMC/SD Mode Single-Block Read Operation Using Edma MMC/SD Mode Multiple-Block Write Operation Using CPU MMC/SD Multiple-Block Write Operation MMC/SD Mode Multiple-Block Read Operation Using CPU MMC/SD Mode Multiple-Block Write Operation Using Edma MMC/SD Mode Multiple-Block Read Operation MMC/SD Mode Multiple-Block Read Operation Using Edma Offset Acronym Register Description MMC Control Register Mmcctl MMC Control Register Mmcctl Field DescriptionsBit Field Value Description MMC Memory Clock Control Register Mmcclk Field Descriptions MMC Memory Clock Control Register MmcclkClken Clkrt Clken MMC Status Register 0 MMCST0 MMC Status Register 0 MMCST0 Field DescriptionsBit Field Write-data CRC error MMC Status Register 1 MMCST1 Field Descriptions MMC Status Register 1 MMCST1Fifoful Fifoemp DAT3ST Drful Dxemp Clkstp Busy Fifoful MMC Interrupt Mask Register Mmcim Field Descriptions MMC Interrupt Mask Register MmcimEtrndne Edated Edrrdy Edxrdy Etrndne MMC Response Time-Out Register Mmctor MMC Response Time-Out Register Mmctor Field DescriptionsTOR MMC Data Read Time-Out Register Mmctod Field Descriptions MMC Data Read Time-Out Register Mmctod MMC Block Length Register Mmcblen MMC Block Length Register Mmcblen Field DescriptionsBlen MMC Number of Blocks Counter Register Mmcnblc MMC Number of Blocks Register MmcnblkMMC Number of Blocks Register Mmcnblk Field Descriptions Nblk MMC Data Transmit Register Mmcdxr MMC Data Receive Register MmcdrrMMC Data Receive Register Mmcdrr Field Descriptions MMC Data Transmit Register Mmcdxr Field Descriptions MMC Command Register Mmccmd Field Descriptions MMC Command Register MmccmdDmatrig Dclr Initck Wdatx Strmtp Dtrw Rspfmt Bsyexp Pplen Stream enable Bit Position Command Register DescriptionCRC7 MMC Argument Register Mmcarghl Field Descriptions MMC Argument Register MmcarghlArgh Argl MMC Response Registers MMCRSP0-MMCRSP7 R2 Response 136 Bits R1, R3, R4, R5, or R6 Response 48 BitsBit Position of Response Register MMCRSP4-0 MMC Command Index Register Mmccidx Field Descriptions MMC Command Index Register MmccidxMMC Data Response Register Mmcdrsp MMC Data Response Register Mmcdrsp Field Descriptions MMC Fifo Control Register Mmcfifoctl Field Descriptions MMC Fifo Control Register MmcfifoctlAccwd Fifolev Fifodir Fiforst Accwd Reference Additions/Modifications/Deletions Table A-1. Document Revision History Appendix a Important Notice