Systems and devices can include forward error correction (FEC) logic to identify a correctable error in the first flit, and correct the correctable error using three error correcting code (ECC) groups. System and devices can also include an error log, the correctable error log to log a symbol number in the first flit corrected by each ECC group, and to log a magnitude of the correctable error corrected by each ECC group in the first flit; and a configuration register to log link error correlation, the link error correlation comprising a indication of one or more bits in error in the first flit.