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Secure digital input/output interface (SDIO)
Table 145. R3 response
RM0008
20.5.5
Bit position
47
46
[45:40]
[39:8]
[7:1]
0
R4 (Fast I/O)
1
1
6
32
7
1
Width (bits
Value
0
0
‘111111’
X
‘1111111’
1
Description
Start bit
Transmission bit
Reserved
OCR register
Reserved
End bit
Code length: 48 bits. The argument field contains the RCA of the addressed card, the
register address to be read out or written to, and its content.
Table 146. R4 response
47
46
[45:40]
Bit position
[31:16]
1
1
6
16
Width (bits
Value
0
0
‘111111’
X
Description
Start bit
Transmission bit
Reserved
RCA
[39:8] Argument field
[15:8]
8
X
register address
20.5.6
[7:1]
0
R4b
[7:0]
8
7
1
X
‘1111111’
1
read register contents
CRC7
End bit
For SD I/O only: an SDIO card receiving the CMD5 will respond with a unique SDIO
response R4. The format is:
Table 147. R4b response
47
46
[45:40]
Bit position
39
[38:36]
1
1
6
16
3
Width (bits
0
0
x
X
X
Value
Description
Start bit
Transmission bit
Reserved
Card is ready
Number of I/O functions
[39:8] Argument field
35
[34:32]
[31:8]
1
3
24
X
X
X
Present memory
Stuff bits
I/O ORC
492/995
Doc ID 13902 Rev 9
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