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.