Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/FMC1/FMC_BCHPBR3#0x0
FMC BCH parity bits register 3
BCH parity bits
https://github.com/modm-io/cmsis-svd-stm32