Decision Feedback Equalizer Optimization for PCI Express Gen6

Abstract

The evolution of the Peripheral Component Interconnect Express (PCIe) standard to Generation 6 (Gen6) introduces significant challenges in signal integrity due to its adoption of Pulse Amplitude Modulation with four symbols (PAM4) at 64 giga-transfers per second (GT/s). This paper presents an optimization approach for Decision Feedback Equalizer (DFE) parameters tailored for PCIe Gen6 links. By leveraging advanced optimization techniques such as Bayesian optimization, we aim to enhance eye diagram margins and overall system robustness. The proposed method is validated through simulations using the MATLAB SerDes Toolbox, demonstrating substantial improvements in signal integrity metrics. The findings indicate that the optimized DFE configuration not only meets PCIe Gen6 specifications but also reduces complexity and power consumption, paving the way for more efficient post-silicon validation processes.