Intel® Cyclone® 10 GX Transceiver PHY User Guide

ID 683054
Date 4/14/2023
Public
Document Table of Contents

3.1.1. Transmit PLLs Spacing Guidelines when using ATX PLLs and fPLLs

ATX PLL-to-ATX PLL Spacing Guidelines

ATX PLLs' VCO frequency offset must be 100 MHz apart. If this requirement cannot be met, use fPLL as transmit PLL to avoid more than one ATX PLL usage. For applications that requires multi-data rate support, use TX PLL switching or TX local clock dividers to achieve the desire data rate reconfiguration.

Note: You are not allowed to recalibrate an ATX PLL if there are TX channels driven by another ATX PLL in transmitting mode.

ATX PLL-to-fPLL Spacing Guidelines

If you are using both ATX PLL and fPLL, and you meet the below two conditions in your applications:
  • When ATX PLL VCO frequency and fPLL VCO frequency is within 50 MHz.
  • ATX PLL is used to drive 6G or 12G SDI protocol.
The ATX PLL and fPLL must be separated at least by one ATX PLL in between.
If you are using both ATX PLL and fPLL, and you meet the following two conditions in your applications:
  • fPLL user re-calibration process is triggered.
  • ATX PLL is used to drive 6G or 12G SDI protocol.
then the ATX PLL and fPLL must be separated at least by one ATX PLL in between (regardless of the ATX PLL and fPLL VCO frequency offset).