4.5. PIPE Direct Mode
In the PIPE Direct mode, either one or both of the PCIe and CXL controller stacks are entirely bypassed, and the PIPE SerDes mode interface is exported across the Embedded Multi-die Interconnect Bridge (EMIB) to the FPGA fabric. This mode allows you to implement your own custom controllers in soft IP.
In PIPE Direct mode, each entire octet must be configured to the same base mode setting (Gen5 capable). All per-lane variations are configured through the PIPE Rate[2:0] and Powerdown[1:0] control settings, which are independent per-lane.