PCIe-4.2.2.5 Precoding

4.2.2.5 Precoding预编码是 PCIe 5.0/6.0 (32GT/s 及 64GT/s) 中极其关键的“信号预处理”技术，它的核心目的是消除因接收端 DFE（判决反馈均衡器）引发的“错误传播（Error Propagation）”。在 SoC 设计 RTL 时，这不仅是加减法逻辑，更涉及跨时钟域的状态机握手与边界重置。引言段A Receiver may request precoding from its transmitter for operating at data rates of 32.0 GT/s and higher. Precoding, when enabled at a Data Rate, applies to both Flit Mode and Non-Flit Mode at that data rate. The precoding rules are as follows:翻译：当接收端需以 32.0 GT/s 或更高数据速率运行时，可向其发射端请求预编码配置。在启