Agilex™ 7 FPGA M-Series HBM2e Development Kit User Guide

ID 782461
Date 12/04/2024
Public
Document Table of Contents

4.2.5.4. The QSFPDD800 PAM4 Tab

Figure 20. The QSFPDD800 PAM4 Tab
Note: This tab has similar control functions as the QSFPDD NRZ 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 21. QSFPDD800PAM4 Tab—PMA Setting