Texas Instruments TMS320DM644x manual MMC Data Response Register Mmcdrsp

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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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