Description:
The XAUI PCS communicates the local/remote link fault to the MAC via the XGMII RX data/control bus during the IDLE period, as defined by the IEEE specification. No other signals are used to communicate fault signaling.
When the RX MAC receives a fault sequence, the fault sequence in the receive pattern can only occur during the idle sequence between 2 RX frames as defined by the IEEE spec.
If the MAC receives a fault sequence, the TX and RX MAC logic will respond in the following manner:
- MAC TX: The MAC completes the current frame transmission first before responding with an appropriate sequence.
- MAC RX: If MAC receives a local fault, then the MAC RX logic drops the corresponding packet.