Our product need FPGA (10AX048E3F29E2SG) & CPU(i7-9700,i5-8400) exchange data through PCIe cable .We often happen device lost .Maybe restart computer ,everything is ok .So we think software about PCIe interface configure document need match. For Ex ,EQ

[User1582077244785968]

De-emphsis ,EQ configure for CPU & FPGA need match .Thanks for your help.

[SengKok_L_Intel]

Hi,

If you are using the cable, the SI may not be optimized:

1. Is the Endpoint and Root Port uses the same physical reference clock? Did you enable the slot clock configuration in the PCIe IP?
2. Is the LTSSM (capture the ltssmstate using signaltap) is looping between L0 and recovery continuously?
3. Could you try to enable the soft DFE controller IP in the PCIe IP?

Regards -SK