Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f7/STM32F730/OTG_FS_DEVICE/OTG_FS_DVBUSDIS#0x0
OTG_FS device VBUS discharge time register
Device VBUS discharge time
https://github.com/modm-io/cmsis-svd-stm32