Multimedia Card Registers
18.5.1.10 SD_CMD Register (offset = 20Ch) [reset = 0h]
SD_CMD is shown in
and described in
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
Copyright © 2011–2013, Texas Instruments Incorporated