Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/Ethernet_MAC/DMASBMR#0x0
System bus mode register
Fixed Burst Length
Address-Aligned Beats
Mixed Burst
Rebuild INCRx Burst
https://github.com/cmsis-svd/cmsis-svd-data