This set of buses is intended to
be used to keep track of sync header errors. There is a pair of
outputs for each PCS Lane. The STAT_RX_FRAMING_ERR_[0-19] output bus
indicates how many sync header errors were received and it is
qualified (that is, the value is only valid) when the corresponding
STAT_RX_FRAMING_ERR_VALID[0-19] is
sampled as a 1.