Agilex™ 7 FPGA I-Series Transceiver-SoC Development Kit User Guide

ID 721605
Date 11/05/2025
Public
Document Table of Contents

4.2.5.4. The QSFPDD800 PAM4 Tab

Similar control functions with the QSFPDD NRZ tab.
Figure 19. The QSFPDD800 PAM4 Tab

PMA Setting

In addition to the PMA settings listed in the QSFPDD NRZ—PMA Setting figure, additional settings are available for the F-Tile FHT PMA. The PMA is set to the default values in the PAM4 designs.

  • Pre-emphasis tap:
    • Post-tap 2: Specifies the amount of pre-emphasis on the second post-tap of the transmitter buffer.
    • Post-tap 3: Specifies the amount of pre-emphasis on the third post-tap of the transmitter buffer.
    • Post-tap 4: Specifies the amount of pre-emphasis on the fourth post-tap of the transmitter buffer.
    • Pre-tap 3: Specifies the amount of pre-emphasis on the third pre-tap of the transmitter buffer.
Figure 20. The QSFPDD800 PAM4 Tab—PMA Setting