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

ID 782461
Date 5/14/2024
Public
Document Table of Contents

4.2.5.4. The QSFPDD800 PAM4 Tab

Figure 16. 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 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 17. QSFPDD800PAM4 Tab — PMA Setting