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RM0008
Table 122. Short response format
Secure digital input/output interface (SDIO)
Bit position
47
46
[45:40]
[39:8]
[7:1]
0
1
1
6
32
7
1
Width
0
0
-
-
-
1
Value
Description
Start bit
Transmission bit
Command index
Argument
CRC7(or 1111111)
End bit
Table 123. Long response format
Bit position
135
134
[133:128]
[127:1]
0
1
1
6
127
1
Width
Value
0
0
111111
-
1
Description
Start bit
Transmission bit
Reserved
CID or CSD (including internal CRC7)
End bit
The command register contains the command index (six bits sent to a card) and the
command type. These determine whether the command requires a response, and whether
the response is 48 or 136 bits long (see Section 20.9.4 on page 499 ). The command path
implements the status flags shown in Table 124 :
Table 124. Command path status flags
Flag
CMDREND
CCRCFAIL
CMDSENT
CTIMEOUT
CMDACT
Description
Set if response CRC is OK.
Set if response CRC fails.
Set when command (that does not require response) is sent
Response timeout.
Command transfer in progress.
The CRC generator calculates the CRC checksum for all bits before the CRC code. This
includes the start bit, transmitter bit, command index, and command argument (or card
status). The CRC checksum is calculated for the first 120 bits of CID or CSD for the long
response format. Note that the start bit, transmitter bit and the six reserved bits are not used
in the CRC calculation.
The CRC checksum is a 7-bit value:
CRC[6:0] = Remainder [(M(x) * x 7 ) / G(x)]
G(x) = x 7 + x 3 + 1
M(x) = (start bit) * x 39 + ... + (last bit before CRC) * x 0 , or
M(x) = (start bit) * x 119 + ... + (last bit before CRC) * x 0
Doc ID 13902 Rev 9
465/995
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