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 Meta Frame Synchronization Word was never received.
The bits of the bus remain asserted until word boundary synchronization occurs or until some other error or failure is signaled for the corresponding lane.