ERMII encoding lookup tables optimized with different goals

Encoding and decoding tables for Enhanced Reduced Media-Independent Interface. Dataset contains 3 sets of lookup tables implementing encoder and decoder. Proposed encoder/decoder garantee that 2-bit TXD/RXD will change each data transmission cycle, making it possible for ERMII interface to work without REF_CLK, TX_EN and CRS_DV lines in difference to regular RMII.6b8b_encdec_v1.mat contains set of lookup tables optimized to minimize simultanious switching noise.6b8b_encdec_v2.mat contains set of lookup tables optimized to minimize number of periods without transition in a lower bit of bitpairs.6b8b_encdec_v3.mat contains set of lookup tables optimized to maximize number simulatnious transitions in both bits of bitpairs.test__6b8b.m contains encoder/decoder test script

本数据集为增强型精简媒体独立接口（Enhanced Reduced Media-Independent Interface, ERMII）提供编解码表。数据集共包含3组用于实现编码器与解码器的查找表。所提出的编解码方案可确保每一轮数据传输周期内，2位发送数据（Transmit Data, TXD）与接收数据（Receive Data, RXD）均会发生电平跳变，使得ERMII接口可无需参考时钟（Reference Clock, REF_CLK）、发送使能（Transmit Enable, TX_EN）以及载波侦听/数据有效（Carrier Sense/Data Valid, CRS_DV）信号线即可正常工作，这一点区别于常规精简媒体独立接口（Reduced Media-Independent Interface, RMII）。其中，6b8b_encdec_v1.mat 包含一组经优化以最小化同时开关噪声的查找表；6b8b_encdec_v2.mat 包含一组经优化以最小化位对低位无跳变周期数量的查找表；6b8b_encdec_v3.mat 包含一组经优化以最大化位对两位同时发生跳变次数的查找表。test__6b8b.m 为该编解码功能的测试脚本。