For 10/100 Mbps, 1 Gbps, and 10/100/1000 Mbps, the Ethernet Medium Access Controller (MAC) is defined in IEEE 802.3-2008 specification clauses 2, 3, and 4. The MAC also supports a non-standard based 2.5 Gbps data rate. At 2.5 Gbps data rate, MAC operation is not standard-based and can be interpreted as a MAC with an internal interface, which is clocked at 312.5 MHz clock. A MAC is responsible for the Ethernet framing protocols and error detection of these frames. The MAC is independent of and can be connected to any type of physical layer.
Important: The 2.5 Gbps data rate is available for internal
mode only. AMD
Artix™
7 support is only available
in -2 and -3. All other devices and speed grades are supported at 2.5 Gbps. Half-duplex
is not available for the internal mode.