Preliminary
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Registers
Table 9-23. Command and Transfer Mode Register (SD_CMD) Field Descriptions (continued)
Bit
Field
Value
Description
2Eh
CMD46 or ACMD46
2Fh
CMD47 or ACMD47
30h
CMD48 or ACMD48
31h
CMD49 or ACMD49
32h
CMD50 or ACMD5
33h
CMD51 or ACMD5
34h
CMD52 or ACMD5
35h
CMD53 or ACMD5
36h
CMD54 or ACMD5
37h
CMD55 or ACMD5
38h
CMD56 or ACMD5
39h
CMD57 or ACMD5
3Ah
CMD58 or ACMD5
3Bh
CMD59 or ACMD5
3Ch
CMD60 or ACMD60
3Dh
CMD61 or ACMD61
3Eh
CMD62 or ACMD62
3Fh
CMD63 or ACMD63
23-22
CMD_TYPE
Command type. This register specifies three types of special commandSuspend, Resume and
Abort. These bits shall be cleared to 0b00 for all other commands.
0
Others commands
1h
Upon CMD52 "Bus Suspend" operation
2h
Upon CMD52 "Function Select" operation
3h
Upon CMD12 or CMD52 "I/O Abort" command
21
DP
Data present select. This register indicates that data is present and SD_DAT line shall be used. It
must be cleared to 0 in the following conditions:
• Command using only SD_CMD line
• Command with no data transfer but using busy signal on SD_DAT0
• Resume command
0
Command with no data transfer
1
Command with data transfer
20
CICE
Command Index check enable. This bit must be set to 1 to enable index check on command
response to compare the index field in the response against the index of the command. If the index
is not the same in the response as in the command, it is reported as a command index error
(SD_STAT[19] CIE bit set to1) NoteThe CICE bit cannot be configured for an Auto CMD12, then
index check is automatically checked when this command is issued.
0
Index check disable
1
Index check enable
19
CCCE
Command CRC check enable. This bit must be set to 1 to enable CRC7 check on command
response to protect the response against transmission errors on the bus. If an error is detected, it is
reported as a command CRC error (SD_STAT[17] CCRC bit set to 1). NoteThe CCCE bit cannot be
configured for an Auto CMD12, and then CRC check is automatically checked when this command
is issued.
0
CRC7 check disable
1
CRC7 check enable
18
Reserved
0
Reserved bit field. Do not write any value.
17-16
RSP_TYPE
Response type. This bits defines the response type of the command.
0
No response
1h
Response Length 136 bits
2h
Response Length 48 bits
3h
Response Length 48 bits with busy after response
977
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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