Fatal Error: Segment Violation at (nil) Module: quartus_fit - Fatal Error: Segment Violation at (nil) Module: quartus_fit Description Due to a problem in the Intel® Quartus® Prime Standard Edition Software version 20.1.1 and earlier, you may see this error during compilation in the fitter stage when ADVANCED_PHYSICAL_OPTIMIZATION is enabled for Stratix® IV devices. Resolution To work around this problem, disable the ADVANCED_PHYSICAL_OPTIMIZATION option and rerun the compilation . This problem is fixed starting with the Intel® Quartus® Prime Standard Edition Software version 21.1 . Custom Fields values: ['novalue'] Troubleshooting 16014424431 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Standard'] 21.1 20.1.1 ['Stratix® IV FPGAs'] ['novalue'] ['novalue'] ['Stratix® IV GX FPGA Dev Kit']