Article ID: 000100507 Content Type: Troubleshooting Last Reviewed: 03/11/2025

Why are the Fmax and resource utilization values different for identical compilation runs?

Description

Due to a problem in the Quartus® Prime Pro Edition Software version 24.3.1, identical compiles might produce different results. This problem occurs because Platform Designer generates intermittent mismatches in synthesis files when parallel IP generation is enabled and only affects the Agilex™ 7 FPGA devices.

 

Resolution

To work around this problem, disable parallel compilation in the Quartus® Prime Pro Edition Software and Platform Designer.
In the Quartus® Prime Pro Edition Software:
•    Go to Assignments > Settings > Compilation Process settings.
•    Under Parallel Compilation, set the Maximum number of processors allowed to 1.
•    Alternatively, you can use the following QSF assignment:
        set_global_assignment -name NUM_PARALLEL_PROCESSORS 1
In Platform Designer:
•    In the Generation dialog box, turn off the Use multiple processors for fast IP generation (when available) option during the HDL file generation.

This problem is scheduled to be fixed in a future release of the Quartus® Prime Pro Edition Software.

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