Agilex™ 7 Clocking and PLL User Guide: F-Series and I-Series

ID 683761
Date 4/01/2024
Document Table of Contents 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. For more information on recalibration methods, refer to the Recalibration Using .mif and the Recalibration Using Advanced Mode sections.