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RM0008
Table 147. R4b response (continued)
Secure digital input/output interface (SDIO)
[7:1]
0
Bit position
7
1
Width (bits
X
1
Value
Description
Reserved
End bit
Once an SD I/O card has received a CMD5, the I/O portion of that card is enabled to
respond normally to all further commands. This I/O enable of the function within the I/O card
will remain set until a reset, power cycle or CMD52 with write to I/O reset is received by the
card. Note that an SD memory-only card may respond to a CMD5. The proper response for
a memory-only card would be Present memory = 1 and Number of I/O functions = 0. A
memory-only card built to meet the SD Memory Card specification version 1.0 would detect
the CMD5 as an illegal command and not respond. The I/O aware host will send CMD5. If
the card responds with response R4, the host determines the card’s configuration based on
the data contained within the R4 response.
20.5.7
R5 (interrupt request)
Only for MultiMediaCard. Code length: 48 bits. If the response is generated by the host, the
RCA field in the argument will be 0x0.
Table 148. R5 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
CMD40
RCA [31:16] of winning
card or of the host
[39:8] Argument field
20.5.8
[7:1]
0
R6
[15:0]
16
7
1
X
X
1
Not defined. May be used
for IRQ data
CRC7
End bit
Only for SD I/O. The normal response to CMD3 by a memory device. It is shown in
Table 149 .
Table 149. R6 response
47
46
[45:40]
Bit position
Width (bits)
1
1
6
Value
0
0
‘101000’
Description
Start bit
Transmission bit
CMD40
Doc ID 13902 Rev 9
493/995
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