The Alveo U50/U50LV accelerator card implements a 16-lane PCI Express edge connector that performs data transfers at the rate of 2.5 giga-transfers per second (GT/s) for Gen1, 5.0 GT/s for Gen2, 8.0 GT/s for Gen3 applications, and 16.0 GT/s for Gen4 applications.
The detailed FPGA connections for this feature are documented in the Alveo U50/U50LV accelerator card XDC file found in the Getting Started tab of the Alveo U50 Product Page. The endpoint is compliant to the v3.0 specification, and compatible with the specification. For additional information about Gen4 compatible features, see UltraScale+ Devices Integrated Block for PCI Express LogiCORE IP Product Guide (PG213).