Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h5/STM32H523/SDMMC/SDMMC_FIFOR1#0x0
SDMMC data FIFO registers 1
Receive and transmit FIFO data
https://github.com/modm-io/cmsis-svd-stm32