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Altera_Forum's avatar
Altera_Forum
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10 years ago

PCIE Gen1 and Gen2 negotiation

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 control...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Probably some signal integrity issue causing the Gen2 data rate to fail during negotiation.