Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B420F2048GL112/ETH/SPECADDR3TOP#0x0
Specific Address 3 Top
Specific address 3 MSB
MAC SA or DA selection
Filter byte Mask
https://github.com/cmsis-svd/cmsis-svd-data