There are management registers in the PHY . Now when the MAC
configures the PHY in loopback mode the TX_EN from MAC is connected to
Also the TX_DATA is connected to RX_DATA .
Now the question is whether TX_ER is connected to RX_ER ? I have
searched in the std 802.3 (2000) but i couldn't find anything related
to it. Hope any one of you friends can help me out.