Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F427/FMC/PIO4#0x0
I/O space timing register 4
IOSETx
IOWAITx
IOHOLDx
IOHIZx
https://github.com/cmsis-svd/cmsis-svd-data