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RM0008
20.2
Secure digital input/output interface (SDIO)
The MultiMediaCard/SD bus connects cards to the controller.
The current version of the SDIO supports only one SD/SDIO/MMC4.2 card at any one time
and a stack of MMC4.1 or previous.
SDIO bus topology
Communication over the bus is based on command and data transfers.
The basic transaction on the MultiMediaCard/SD/SD I/O bus is the command/response
transaction. These types of bus transaction transfer their information directly within the
command or response structure. In addition, some operations have a data token.
Data transfers to/from SD/SDIO memory cards are done in data blocks. Data transfers
to/from MMC are done data blocks or streams. Data transfers to/from the CE-ATA Devices
are done in data blocks.
Figure 177. SDIO “no response” and “no data” operations
From host to card(s)
From host to card
From card to host
SDIO_CMD
Command
Command
Response
SDIO_D
Operation (no response)
Operation (no data)
ai14734
Figure 178. SDIO (multiple) block read operation
From host to card From card to host
data from card to host
Stop command
stops data transfer
SDIO_CMD
SDIO_D
Command
Response
Data block crc
Data block crc
Command
Data block crc
Response
Block read operation
Multiple block read operation
Data stop operation
ai14735
Doc ID 13902 Rev 9
457/995
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