Preliminary
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Registers
9.4.12 Command Argument Register (SD_ARG)
This register contains command argument specified as bit 39-8 of Command-Format. These registers
must be initialized prior to sending the command itself to the card (write action into the register
SD_CMD register). Only exception is for a command index specifying stuff bits in arguments, making a
write unnecessary.
The command argument register (SD_ARG) is shown in
and described in
.
Figure 9-40. Command Argument Register (SD_ARG)
31
0
ARG
R/W-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-22. Command Argument Register (SD_ARG) Field Descriptions
Bit
Field
Value
Description
31-0
ARG
Command argument bits [31:0]
.
9.4.13 Command and Transfer Mode Register (SD_CMD)
•
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.
NOTE:
In SYSTEST mode, a write into SD_CMD register will not start a transfer.
The command and transfer mode register (SD_CMD) is shown in
and described in
.
Figure 9-41. Command and Transfer Mode Register (SD_CMD)
31
30
29
24
Reserved
INDX
R-0
R/W-0
23
22
21
20
19
18
17
16
CMD_TYPE
DP
CICE
CCCE
Reserved
RSP_TYPE
R/W-0
R/W-0
R/W-0
R/W-0
R-0
R/W-0
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
Reserved
MSBS
DDIR
Reserved
ACEN
BCE
DE
R-0
R/W-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
975
SPRUGX9 – 15 April 2011
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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