Arria® 10 Transceiver PHY User Guide

ID 683617
Date 4/01/2024
Public
Document Table of Contents

6.11.2.1. ATX Reference Clock Switching

You can use the reconfiguration interface on the ATX PLL instance to specify which reference clock source drives the ATX PLL. The ATX PLL supports clocking up to five different reference clock sources. The flow to select between the different reference clock sources is independent of the number of transmitter PLLs specified in the Parameter Editor.

Before initiating a reference clock switch, ensure that your ATX PLL instance defines more than one reference clock source. Specify the Number of PLL reference clocks parameter on the PLL tab during ATX PLL parameterization.

The following table shows the addresses and bits for switching between ATX PLL reference clock inputs. The number of exposed