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
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    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