The Receive Status transfer is used when the
receive AXI4-Stream interface is tied directly to the
transmit AXI4-Stream interface for the purpose of looping
back Ethernet receive data to the Ethernet transmit interface with no external
intervention. In that case, the status transfer enables the receive data frame to be
presented to the TEMAC transmitter and the status content is ignored. No advanced
checksum offload or VLAN functions is allowed for these operations even if they were
included in the subsystem at build time. Note the different identification flag value in
the following figure.
Figure 1. Receive Status Transmit AXI4-Stream Waveform