Intel® Agilex™ Clocking and PLL User Guide

ID 683761
Date 3/26/2022
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2.1.3.1.3. I/O PLL Clock Gate

You can dynamically gate each output counter of the Intel® Agilex™ I/O PLL. This I/O PLL clock gate provides a useful alternative to the root clock gate. The root clock gate can gate only 1 of 7 output counters.

However, the I/O PLL clock gate is not cycle-specific. When you use the I/O PLL clock gate, expect a delay of several clock cycles between the assertion or deassertion of the clock gate and the corresponding change to the clock signal. The number of delay cycles is non-deterministic because the enable signal must be synchronized into the clock domain of the output clock, ensuring a glitch-free gate.

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