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RM0008
20.5.1
Secure digital input/output interface (SDIO)
R1 (normal response command)
Code length = 48 bits. The 45:40 bits indicate the index of the command to be responded to,
this value being interpreted as a binary-coded number (between 0 and 63). The status of the
card is coded in 32 bits.
Table 143. R1 response
20.5.2
Bit position
47
46
[45:40]
[39:8]
[7:1]
0
R1b
1
1
6
32
7
1
Width (bits
0
0
X
X
X
1
Value
Description
Start bit
Transmission bit
Command index
Card status
CRC7
End bit
It is identical to R1 with an optional busy signal transmitted on the data line. The card may
become busy after receiving these commands based on its state prior to the command
reception.
20.5.3
R2 (CID, CSD register)
Code length = 136 bits. The contents of the CID register are sent as a response to the
CMD2 and CMD10 commands. The contents of the CSD register are sent as a response to
CMD9. Only the bits [127...1] of the CID and CSD are transferred, the reserved bit [0] of
these registers is replaced by the end bit of the response. The card indicates that an erase
is in progress by holding MCDAT low. The actual erase time may be quite long, and the host
may issue CMD7 to deselect the card.
Table 144. R2 response
20.5.4
Bit position
135
134
[133:128]
[127:1]
0
R3 (OCR register)
Width (bits
1
1
6
127
1
0
0
‘111111’
X
1
Value
Description
Start bit
Transmission bit
Command index
Card status
End bit
Code length: 48 bits. The contents of the OCR register are sent as a response to CMD1.
The level coding is as follows: restricted voltage windows = low, card busy = low.
Doc ID 13902 Rev 9
491/995
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