When a bit of this bus is 1, it indicates one of several possible failures on the corresponding lane.
•Word boundary synchronization in the lane was not possible using Framing bits [65:64].
•After word boundary synchronization in the lane was achieved, errors were detected on Framing bits [65:64].
•After word boundary synchronization in the lane was achieved, a valid PCS Lane Marker Word was never received.
The bits of the bus remain asserted until word boundary synchronization occurs or until some other error/failure is signaled for the corresponding lane.