Secure digital input/output interface (SDIO) RM0090
1020/1749 RM0090 Rev 18
31.2 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 321. SDIO “no response” and “no data” operations
Figure 322. SDIO (multiple) block read operation
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Operation (no response) Operation (no data)
SDMMC_CMD
SDMMC_D
From host to card(s) From host to card From card to host
ResponseCommand Command
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Command Response
Data block crc
Data block crc Data block crc
Block read operation
Multiple block read operation
Data stop operation
From host to card From card to host
data from card to host Stop command
stops data transfer
Command Response
SDMMC_CMD
SDMMC_D
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