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

ID 683872
Date 4/01/2024
Public
Document Table of Contents

4.5. Guidelines for Refclk #i is Active At and After Device Configuration

The Refclk #i is active at and after device configuration feature is only supported by Agilex™ 7 F-Tile devices mentioned in Appendix A.1 . In designs that target other OPN devices, you must set the Refclk #i is active at and after device configuration to On, and you must provide stable reference clocks for the system PLLs and FGT at and after device configuration time.

In addition, if the Refclk #i is not available and stable at device power-up, set the Refclk #i is active at and after device configuration parameter to OFF to avoid clock buffer degradation.