Article ID: 000074686 Content Type: Troubleshooting Last Reviewed: 02/12/2023

Why does the PLL in Stratix® V, Arria® V, or Cyclone® V devices fail to reconfigure with certain compilation seeds?

Environment

    Intel® Quartus® Prime Standard Edition
    PLL Reconfig Intel® FPGA IP
    PLL Intel® FPGA IP
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Description

The phase-locked loop (PLL) in Stratix® V, Arria® V, or Cyclone® V devices  might fail to reconfigure with the waitrequest signal of the PLL reconfiguration intellectual property (IP) being stucked at ‘1’. This is observed to take place for certain compilation seeds and might happen if the Physical Synthesis option in the Fitter (Advanced) settings of the Intel® Quartus® Prime Software is enabled. 

Resolution

To work around this problem, disable the following settings in the Intel® Quartus® Prime Software:

Go to Assignments -> Settings -> Compiler Settings -> Fitter (Advanced) Settings:

Set Enable Physical Synthesis for Combinational Logic for Area to OFF.

Set Enable Physical Synthesis for Combinational Logic for Performance to OFF.

This problem is known to affect only the dynamic reconfiguration instance and hence the physical synthesis setting can be disabled only for the PLL Reconfig IP variation, if needed.

Related Products

This article applies to 3 products

Stratix® V FPGAs
Cyclone® V FPGAs and SoC FPGAs
Arria® V FPGAs and SoC FPGAs

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