PCI Express® (PCIe®) 6.0 links operating at 64 GT/s using PAM4 signaling have a reach of up to 13 inches at nominal conditions on standard PCBs. Extending trace routing beyond this distance results in higher first bit error rates (FBER) and reduced link efficiency due to increased link recovery and retransmissions.
As new distributed architectures are deployed in data centers, greater flexibility is desired for chip placement including the need for longer trace lengths. Protocol-aware retimer chips can fully regenerate signals allowing board designers to extend reach and flexibly build various system topologies. The Rambus PCIe 6.0 Retimer Controller provides a complete digital data path solution that delivers best-in-class latency, power and area, and accelerates the time-to-market for PCIe 6.0 retimer chips.
The PCIe 6.0 Retimer Controller provides a highly optimized low-latency data path for signal regeneration. It supports retimer chip PHYs via PIPE 5.2/6.1 interfaces. The control plane interface is provided via CSR (AHB-lite). The PCIe 6.0 Retimer Controller is CXL protocol aware and supports links using 64 GT/s and lower data rates of PCIe.
The PCIe 6.0 Retimer Controller provides designers with highly configurable equalization algorithms and adaptive behaviors. Its advanced RAS features enable control, observation and debugging of the controller and PHYs in silicon. Further, it supports various PCIe clocking architectures.
The PCIe interface is the critical backbone that moves data at high bandwidth and low latency between various compute nodes such as CPUs, GPUs, FPGAs, and workload-specific accelerators. With the torrid rise in bandwidth demands of advanced workloads such as AI/ML training, PCIe 6.0 jumps signaling to 64 GT/s with some of the biggest changes yet in the standard.
Complete digital data path solution for PCIe 6.0 retimer chips