Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/FMC1/FMC_CSQCR#0x0
FMC NAND command sequencer control register
Command Sequencer Enable
https://github.com/modm-io/cmsis-svd-stm32