Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U585/FMAC/SR#0x0
FMAC Status register
Y buffer empty flag
X1 buffer full flag
Overflow error flag
Underflow error flag
Saturation error flag
https://github.com/modm-io/cmsis-svd-stm32