Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F7x3/OTG_HS_DEVICE/OTG_HS_DIEPDMA2#0x0
OTG_HS device endpoint-3 DMA address register
DMA address
https://github.com/cmsis-svd/cmsis-svd-data