Internal Error: Sub-system: FYGR, File: /quartus/fitter/fygr/fygr_post_fit_legality_op.cpp, Line: 320 - Internal Error: Sub-system: FYGR, File: /quartus/fitter/fygr/fygr_post_fit_legality_op.cpp, Line: 320 Description Due to a problem in the Quartus® Prime Software Standard Edition Software version 17.0 Update 2 or earlier, you may see this problem during Fitter stage. Resolution To work around this problem, apply the following fitter setting: In the Quartus Setting file (.qsf), set_global_assignment -name FINAL_PLACEMENT_OPTIMIZATION ALWAYS Or in Quartus Settings, Assignments -> Settings -> Compiler Settings -> Advanced Settings (Fitter) -> Final Placement Optimizations (Always) Custom Fields values: ['novalue'] Troubleshooting FB: 506068; False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software QUARTUS-ALITE', 'FPGA Dev Tools Quartus® Prime Software Standard'] novalue 17.0.2 ['MAX® II CPLDs', 'MAX® V CPLDs'] ['novalue'] ['novalue'] ['novalue']