The TEMAC can be implemented with an optional Ethernet AVB
endpoint that is made up of two key functional blocks. When this functionality is not
included, the AXI4-Stream TX Data is passed directly to the transmit
engine. The AXI4-Stream RX Data is always passed directly to you, with the
relative tuser signals being used to validate the data on the required
interface.
Important: AVB is only available for GMII/RGMII modes at
100/1000 Mbps speeds. It is not available for MII or 2.5 Gbps data rate.