In a full-duplex system, there is a point-to-point dedicated connection between two Ethernet devices, capable of simultaneously transmit and receive with no possibility of collisions. The Ethernet MAC does not use the carrier sense signal from the external PHY because the medium is not shared and the Ethernet MAC only needs to monitor its own transmissions. After the last bit of an Ethernet MAC frame transmission, the Ethernet MAC starts the interframe gap timer and defer transmissions until the IFG count completes. The minimum value supported for the IFG depends on the TEMAC solution options and the current mode of operation.
If the TEMAC solution has been
built with half-duplex support, the IFG delay is 96-bit times. When
IFG Adjustment is enabled, greater than 64-bit times, the value
presented on tx_ifg_delay .
If the TEMAC solution has been
built with only full-duplex support, the IFG delay is 96-bit times.
When IFG Adjustment is enabled, greater than 32-bit times, the
value presented on tx_ifg_delay .