Secure digital input/output interface (SDIO) RM0008
580/1096 Doc ID 13902 Rev 12
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.
22.5.7 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.
22.5.8 R6
Only for SD I/O. The normal response to CMD3 by a memory device. It is shown in
Table 165.
[7:1] 7 X Reserved
0 1 1 End bit
Table 163. R4b response (continued)
Bit position Width (bits Value Description
Table 164. R5 response
Bit position Width (bits Value Description
47 1 0 Start bit
46 1 0 Transmission bit
[45:40] 6 ‘111111’ CMD40
[39:8] Argument field
[31:16] 16 X
RCA [31:16] of winning
card or of the host
[15:0] 16 X
Not defined. May be used
for IRQ data
[7:1] 7 X CRC7
0 1 1 End bit
Table 165. R6 response
Bit position Width (bits) Value Description
47 1 0 Start bit
46 1 0 Transmission bit
[45:40] 6 ‘101000’ CMD40
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