Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/Ethernet_MAC/TX_LPI_USEC_CNTR#0x0
Tx LPI microsecond timer register
TXLPIUSC
https://github.com/modm-io/cmsis-svd-stm32