09-25-2019 10:55 PM
I am using 7-series GTX generated using Kintex-7 XC7K325T. Following configuration is used: -
1. CPLL is used for Clocking,
2. 8B/10B as well as comma alignment are disabled and data is being given in the 8b/10b encoded format,
3. GTX Common Reset Block is bypassed.
In Simulation when the GTX Tx and Rx are being loopbacked then it is working fine. But when Tx and Rx of different GTX are being used, then code error and disparity errors are coming randomly.
10-09-2019 08:25 AM
Without comma alignment the serial to parallel converter has no way to frame the data properly. While it might randomly work in loopback it is never gauranteed. You need 8B10B or 64B66B to be able to do alignment. You should consider using a canned protocol like Aurora that will take care of these issues for you.