Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G20/EMAC/TSR#0x0
Transmit Status Register
Used Bit Read
Collision Occurred
Retry Limit exceeded
Transmit Go
Buffers exhausted mid frame
Transmit Complete
Transmit Underrun
https://github.com/cmsis-svd/cmsis-svd-data