Stratix® 10 Clocking and PLL User Guide

ID 683195
Date 7/11/2024
Public
Document Table of Contents

3.4. Guideline: Configuration Constraints

The I/O PLL configuration must obey the following constraints:

  • The phase frequency detector (PFD) and VCO each have a legal frequency range of operation.
  • The loop filter settings must be appropriate for the M counter value and user-selected bandwidth mode.

If any of these configuration constraints are violated, the I/O PLL may fail to lock or may exhibit poor jitter performance.