Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F427/FMC/SDTR1#0x0
SDRAM Timing register 1
Load Mode Register to Active
Exit self-refresh delay
Self refresh time
Row cycle delay
Recovery delay
Row precharge delay
Row to column delay
https://github.com/cmsis-svd/cmsis-svd-data