Multimedia Card Registers
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18.5.1.10 SD_CMD Register (offset = 20Ch) [reset = 0h]
SD_CMD is shown in Figure 18-46 and described in Table 18-29.
SD_CMD[31:16] = the command register. SD_CMD[15:0] = the transfer mode. This register configures the
data and command transfers. A write into the most significant byte send the command. A write into
SD_CMD[15:0] registers during data transfer has no effect. This register can be used for any card. In
SYSTEST mode, a write into SD_CMD register will not start a transfer.
Figure 18-46. SD_CMD Register
31 30 29 28 27 26 25 24
Reserved INDX
R-0h R/W-0h
23 22 21 20 19 18 17 16
CMD_TYPE DP CICE CCCE Reserved RSP_TYPE
R/W-0h R/W-0h R/W-0h R/W-0h R-0h R/W-0h
15 14 13 12 11 10 9 8
Reserved
R-0h
7 6 5 4 3 2 1 0
Reserved MSBS DDIR Reserved ACEN BCE DE
R-0h R/W-0h R/W-0h R-0h R/W-0h R/W-0h R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
3406
Multimedia Card (MMC) SPRUH73H–October 2011–Revised April 2013
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