The Intel® Arria® 10 PCI Express* Hard IP core configured in Gen3 mode may exhibit several link recoveries or down-train due to bit errors.
Starting in Quartus® Prime v17.0, there is an option in the Arria 10 PCIe Hard IP component to enable the Soft DFE Controller IP to improve link stability for Gen3 Endpoint mode. For Gen3 Rootport mode, this IP support is expected a later release of the Quartus Prime software. The Soft DFE Controller IP is recommended for Arria 10 open systems, and for closed systems that have short reflective links.
The Soft DFE Controller IP is not supported for Autonomous HIP or CvP modes.