Hello team,
Could you advise how I can decide whether the eye diagram is okay or not? To clarify the question, I brought a capture that I took before. It's for checking if PCIe 2.0 can be linked up. The input eye height is 124.69 ps and the output eye height is 113.12 ps. How do I judge whether this difference is in the level of 'okay' or in the level of 'EQ modification required'?
My question is not confined to the PCIe case. I want to know if there is a general rule to judge the eye diagram. Is there any specification defined by any institute, which is based on protocols, data rate, BER etc.?
- before the redriver
- after the redriver
