IOPLL Intel® FPGA IP Core User Guide

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ID 683285
Date 2/06/2023
Public
Document Table of Contents
Document Table of Contents x
IOPLL Intel® FPGA IP Core User Guide
IOPLL Intel® FPGA IP Core User Guide x
Device Family Support IOPLL IP Core Parameters Functional Description IOPLL Intel® FPGA IP Core User Guide Archives Document Revision History for the IOPLL Intel® FPGA IP Core User Guide
IOPLL IP Core Parameters x
IOPLL IP Core Parameters - PLL Tab IOPLL IP Core Parameters - Settings Tab IOPLL IP Core Parameters - Cascading Tab IOPLL IP Core Parameters - Dynamic Reconfiguration Tab IOPLL IP Core Parameters - Advanced Parameters Tab
Functional Description x
Building Blocks of a PLL PLL Lock Operation Modes Output Clocks Reference Clock Switchover PLL-to-PLL Cascading Ports
IOPLL Intel® FPGA IP Core User Guide

PLL Lock

The PLL lock is dependent on the two input signals in the phase frequency detector. The lock signal is an asynchronous output of the PLLs.7

The number of cycles required to gate the lock signal depends on the PLL input clock which clocks the gated-lock circuitry. Divide the maximum lock time of the PLL by the period of the PLL input clock to calculate the number of clock cycles required to gate the lock signal.

7 Timing analyzer may report the PLL lock signal as synchronous due to the signal being in the same clock domain as the reference clock signal. However, the PLL lock signal is designed to be an asynchronous signal with the addition of a synchronizer.
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