Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F107xx/ETHERNET_MMC/MMCCR#0x0
Ethernet MMC control register (ETH_MMCCR)
Counter reset
Counter stop rollover
Reset on read
MMC counter freeze
https://github.com/cmsis-svd/cmsis-svd-data