Texas Instruments TMS320DM644x Manuale Utente
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4.16 MMC Data Response Register (MMCDRSP)
4.17 MMC Command Index Register (MMCCIDX)
Registers
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).
stored in the MMC data response register (MMCDRSP).
The MMC data response register (MMCDRSP) is shown in
and described in
.
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
), the CRC status token is stored in DRSP.
The MMC command index register (MMCCIDX) stores the first byte of a response from a memory card.
and
show the format for each type of response.
The MMC command index register (MMCCIDX) is shown in
and described in
.
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