At 64 GT/s, inter-symbol interference (ISI) is a major hurdle. The spec defines advanced equalization requirements for both the Transmitter (Tx) and Receiver (Rx):
Note: The official PDF document is proprietary to the PCI-SIG. Access requires membership in the consortium, though summary whitepapers and technical overviews are publicly available on the PCI-SIG website. pci express base specification revision 6.0 pdf
Despite the addition of FEC (which adds processing delay), the spec targets ultra-low latency. By keeping the FEC lightweight and leveraging fixed-size Flits, the protocol minimizes the variability of latency, making PCIe 6.0 suitable for real-time applications like AI inferencing and high-frequency trading. At 64 GT/s, inter-symbol interference (ISI) is a
The is not merely an incremental speed bump; it is a survival mechanism for the future of copper-based interconnects. By adopting PAM-4 signaling and integrating Forward Error Correction, the PCI-SIG has successfully doubled bandwidth while keeping the signal frequencies within the manageable range of 32 GHz. Despite the addition of FEC (which adds processing