Add FEC error counters.
Implemented FEC error counters for lpGBT channels.
- If more than one FEC error occurs in one clock cycle, all errors are counted
- The counter is 32b, but overflows and rolls back to 0
- The counter is reset when the lpGBT alignment is false
FEC error counter now counts in 4 pipeline stages, starting by 10 groups of 23 bits, then add 5 values in 2 counters, then add the 2 counters, then increment the 32b counter by that value.
Closes FLX-1954
Edited by Frans Schreuder
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