Cut Through Mode with Width Adaptation

This mode behaves like Cut Through mode, but is used when the AXI data width does not match the PHY data width and the transmit FIFO is disabled. In this case, a shallow FIFO is inserted to perform width adaptation between the AXI4-stream interface and the PHY interface.

• Transmission still starts before the end of the frame is received, minimizing latency
• The shallow FIFO is only used for width conversion and does not buffer the entire frame.