F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

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Date 1/24/2024
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5.7.1. PAM4 Encoding Schemes in Simulation

When simulating the FGT or FHT transceivers in PAM4 mode, the following tables represent the encoding schemes for the positive (_p) and negative (_n) serial lines:
Table 109.  FGT PAM4 Encoding Scheme
Non-Gray Input MSB, LSB Gray Input MSB, LSB Simulation Output for P, N
11 10 1, Z
10 11 1, 0
01 01 0, Z
00 00 0, 1
Table 110.  FHT PAM4 Encoding Scheme
Input MSB, LSB Simulation Output for P, N
11 11
10 10
01 01
00 00