The Alveo U55C data center 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 U55C data center accelerator card XDC file found in the Getting Started tab of the Alveo U55C Product Page. The endpoint is compliant to the v3.0 PCIe specification, and compatible with the Gen4 specification. For additional information about Gen4 compatible features, see UltraScale+ Devices Integrated Block for PCI Express LogiCORE IP Product Guide (PG213).