Intel Agilex User Manual page 25

2. Intel Agilex Clocking and PLL Architecture and Features
UG-20216 | 2019.04.02
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
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.
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Intel Agilex Clocking and PLL User Guide
25