Other Parts Discussed in Thread: AM5728
what is the differential trace impedance of PCIe Gen2 and Gen3 that AM5708 recommends and PCIe related timing parameters?
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I have the same question regarding the AM5728. I found a TI application note which states the PCIe Zdiff should be 100 Ohms +/- 10%. This matches other sources I've found for PCIe Gen 1 but Gen 2 & 3 should be 85 Ohms +/- 15%. We are using PCIe Gen 2 in our design but it will often revert back to gen 1 speeds.
100ohm is allowed and recommended. Also, AM57xx only supports up to PCIe Gen2.