RM0033 Rev 9 773/1381
RM0033 Secure digital input/output interface (SDIO)
791
26.5.8 R6
Only for SD I/O. The normal response to CMD3 by a memory device. It is shown in
Table 132.
The card [23:8] status bits are changed when CMD3 is sent to an I/O-only card. In this case,
the 16 bits of response are the SD I/O-only values:
• Bit [15] COM_CRC_ERROR
• Bit [14] ILLEGAL_COMMAND
• Bit [13] ERROR
• Bits [12:0] Reserved
26.6 SDIO I/O card-specific operations
The following features are SD I/O-specific operations:
• SDIO read wait operation by SDIO_D2 signalling
• SDIO read wait operation by stopping the clock
• SDIO suspend/resume operation (write and read suspend)
• SDIO interrupts
The SDIO supports these operations only if the SDIO_DCTRL[11] bit is set, except for read
suspend that does not need specific hardware implementation.
[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 131. R5 response (continued)
Bit position Width (bits Value Description
Table 132. R6 response
Bit position Width (bits) Value Description
47 1 0 Start bit
46 1 0 Transmission bit
[45:40] 6 ‘101000’ 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
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