Intel Agilex® 7 Clocking and PLL User Guide: M-Series

ID 769001
Date 8/14/2023
Public
Document Table of Contents

2.2.13.2. User Calibration

The I/O PLL must be recalibrated for any of the following conditions after device power up:

  • Dynamic I/O PLL reconfiguration that changes the M or N counter settings is performed.
  • Change of the reference clock frequency to the I/O PLL.

Recalibration is not necessary when using clock switchover to a secondary reference clock with a different frequency than the primary reference clock. The I/O PLL stores the calibration settings for both reference clocks after power-up calibration.