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

ID 683872
Date 11/04/2024
Public
Document Table of Contents

4.6.3.1. How to Determine Which Common PLL Your FHT Channel is Using

Within each FHT Quad, there are two common PLLs which cascade to the lane PLLs as described in FHT Reference Clock Network . These TX PLLs are PLL A and PLL B. In order to determine which common PLL your design is using, you must read the locations on the reconfig_xcvr Avalon® Memory-Mapped bus as shown in the following table. The location is subject to the rules outlined in section Configuration Registers . A value of 1’b1 indicates that the common PLL is being used.
Table 106.  FHT Common TX PLL Avalon® Memory-Mapped Address
FHT Channel Address and Bit
A 0x6205C[0]
B 0x62060[0]