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Secure digital input/output interface (SDIO)
RM0008
Figure 187. SDIO command transfer
at least 8 SDIO_CK cycles
SDIO_CK
Command
Response
Command
State
SDIO_CMD
Idle
Hi-Z
Send
Controller drives
Wait
Hi-Z
Receive
Card drives
Idle
Hi-Z
Send
Controller drives
ai14707
●
Command format
–
Command: a command is a token that starts an operation. Command are sent
from the host either to a single card (addressed command) or to all connected
cards (broadcast command are available for MMC V3.31 or previous). Commands
are transferred serially on the CMD line. All commands have a fixed length of 48
bits. The general format for a command token for MultiMediaCards, SD-Memory
cards and SDIO-Cards is shown in Table 121 . CE-ATA commands are an
extension of MMC commands V4.2, and so have the same format.
The command path operates in a half-duplex mode, so that commands and
responses can either be sent or received. If the CPSM is not in the Send state, the
SDIO_CMD output is in the Hi-Z state, as shown in Figure 187 on page 464 . Data
on SDIO_CMD are synchronous with the rising edge of SDIO_CK. Table shows
the command format.
Table 121. Command format
Bit position
47
46
[45:40]
[39:8]
[7:1]
0
1
1
6
32
7
1
Width
0
1
-
-
-
1
Value
Description
Start bit
Transmission bit
Command index
Argument
CRC7
End bit
–
Response: a response is a token that is sent from an addressed card (or
synchronously from all connected cards for MMC V3.31 or previous), to the host
as an answer to a previously received command. Responses are transferred
serially on the CMD line.
The SDIO supports two response types. Both use CRC error checking:
●
●
48 bit short response
136 bit long response
Note:
464/995
If the response does not contain a CRC (CMD1 response), the device driver must ignore the
CRC failed status.
Doc ID 13902 Rev 9
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