ST STM32L4+ Series Reference Manual page 1964

Secure digital input/output MultiMediaCard interface (SDMMC)
SDMMC_CMD
CMD Response
SDMMC_D
From host to card
From card to host
Note: The Stop Transmission command is not required at the end of an e•MMC multiple block
write with predefined block count.
Note: The SDMMC will not send any data as long as the Busy signal is asserted (SDMMC_D0
pulled low).
SDMMC_CMD
CMD
SDMMC_D
From host to card
From card to host
SDMMC_CMD
CMD
SDMMC_D
From host to card
From card to host
Stream data transfer operates only in a 1-bit wide bit bus configuration on SDMMC_D0 in
single data rate modes (DS, HS, and SDR).
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Figure 570. SDMMC (multiple) block write operation
CRC
Data block CRC
status
Block write operation
Multiple block write operation
Figure 571. SDMMC (sequential) stream read operation
Response
Stream read operation
Figure 572. SDMMC (sequential) stream write operation
Response
Stream write operation
RM0432 Rev 6
CRC
Busy
Data block CRC
status
Data stream
Data stream
RM0432
Data stop operation
CMD Response
Busy
MSv40156V1
Data stop operation
CMD Response
MSv40157V2
Data stop operation
CMD Response
Busy
MSv40158V2