PCIe Connector/Data Rates

Alveo U55C Data Center Accelerator Cards Data Sheet (DS978)

Document ID
DS978
Release Date
2022-09-01
Revision
1.1 English

The Alveo U55C accelerator card uses an UltraScale+™ FPGA containing a PCIE4C block. The PCIE4C block is compliant to the PCI Express Base Specification v3.1 supporting up to 8.0 GT/s (Gen3 x16) and compatible with PCI Express Base Specification v4.0 supporting up to 16.0 GT/s (Gen4 x8). The PCIE4C block is also compliant with CCIX Base Specification Revision 1.0 v0.9, supporting speeds up to 16.0 GT/s. The PCI Express interface can also be configured into dual x8 interfaces and connected to hosts that support PCI Express bifurcation.

Table 1. PCI Express Data Transfer Rate Performance
PCI Express Generation Performance
Gen 1 2.5 GigaTransfers per second (GT/s)
Gen 2 5.0 GT/s
Gen 3 8.0 GT/s
Gen 4 1 16.0 GT/s
  1. For a list of limitations when operating at the Gen4 rate, see UltraScale+ Devices Integrated Block for PCI Express LogiCORE IP Product Guide (PG213).