Figure 321. Sdio "No Response" And "No Data" Operations; Figure 322. Sdio (Multiple) Block Read Operation - ST STM32F405 Reference Manual

Secure digital input/output interface (SDIO)
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.
SDMMC_CMD
SDMMC_D
SDMMC_CMD
SDMMC_D
1020/1749

Figure 321. SDIO "no response" and "no data" operations

From host to card(s)
Command
Operation (no response)

Figure 322. SDIO (multiple) block read operation

From host to card From card to host
Command Response
Data block crc
Block read operation
Multiple block read operation
RM0090 Rev 18
From host to card
Command
Operation (no data)
data from card to host
Data block crc
From card to host
Response
Stop command
stops data transfer
Command Response
Data block crc
Data stop operation
RM0090
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