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

ID 683872
Date 9/29/2025
Public
Document Table of Contents

A.6.4.4. F-Tile FGT Tuning Examples

The following section describes three F-Tile FGT tuning examples.

For NRZ tuning, you can start with the recommended settings in Table 125 to narrow down the range of each TXEQ setting and apply the exhaustive flow chart in F-Tile FGT Flow Chart to Find Optimal TX Equalization Settings for NRZ to find the optimal TX equalization settings. There may be many TXEQ settings that can achieve 0 BER. You can use the eye height value to further decide the best setting.

For PAM4 tuning, you can follow the tuning guide in F-Tile FGT PAM4 Tuning Flow.

The ttk_helper_ftile.tcl script is inside each design's scripts folder. The TXEQ sweep function is proc sweep_txeq_ber. You can easily control the parameters in this function to sweep the TXEQ setting to get the BER value and eye height value.