R4 (Fast I/O); R4B; Table 161. R3 Response; Table 162. R4 Response - ST STM32F101xx Reference Manual

RM0008

Table 161. R3 response

Bit position
47
46
[45:40]
[39:8]
[7:1]
0
22.5.5

R4 (Fast I/O)

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 162. R4 response

47
46
[45:40]
[39:8] Argument field
[7:1]
0
22.5.6

R4b

For SD I/O only: an SDIO card receiving the CMD5 will respond with a unique SDIO
response R4. The format is:

Table 163. R4b response

47
46
[45:40]
[39:8] Argument field
Width (bits
1
1
6
32
7
1
Bit position
[31:16]
[15:8]
[7:0]
Bit position
39
[38:36]
35
[34:32]
[31:8]
Doc ID 13902 Rev 12
Secure digital input/output interface (SDIO)
Value
0
0
'111111'
X
'1111111'
1
Width (bits
1 0
1 0
6 '111111'
16 X
8 X
8 X
7 '1111111'
1 1
Width (bits
1 0
1 0
6 x
16 X
3 X
1 X
3 X
24 X
Description
Start bit
Transmission bit
Reserved
OCR register
Reserved
End bit
Value Description
Start bit
Transmission bit
Reserved
RCA
register address
read register contents
CRC7
End bit
Value Description
Start bit
Transmission bit
Reserved
Card is ready
Number of I/O functions
Present memory
Stuff bits
I/O ORC
579/1096