Debug Register
| RPESTS | MAC MII Receive Protocol Engine Status |
| RFCFCSTS | MAC Receive Frame Controller FIFO Status |
| RWCSTS | MTL Rx FIFO Write Controller Active Status |
| RRCSTS | MTL Rx FIFO Read Controller State |
| RXFSTS | MTL Rx FIFO Fill-level Status |
| TPESTS | MAC MII Transmit Protocol Engine Status |
| TFCSTS | MAC Transmit Frame Controller Status |
| TXPAUSED | MAC transmitter in PAUSE |
| TRCSTS | MTL Tx FIFO Read Controller Status |
| TWCSTS | MTL Tx FIFO Write Controller Active Status |
| TXFSTS | MTL Tx FIFO Not Empty Status |
| TXSTSFSTS | MTL TxStatus FIFO Full Status |