I've got a board, that sometimes powers up with the BIOS recognising 4 lanes at Gen 2 and sometimes the BIOS only recognises 4 lanes at Gen 1. I'm using a Cyclone 5 CST part, and the hard IP controller with Avalon ST. Is there any reason why I'm not consistently getting Gen 2?Cheers, Simon
I've encountered this problem at my previous workplace repeatedly.For a starter, take a closer look at your AC coupling capacitors, to see if any are either damaged or missing (for a 4x PCIe you should have 8 of those). Another failure may arise from a damaged connector - the connector must be clean without any signs of scratches. Report back when you have a chance, Refael.