Internal Error: Sub-system: FITCC, File: /quartus/fitter/fitcc/fitcc_periph_to_core_routing_solver.cpp, Line: 59 - Internal Error: Sub-system: FITCC, File: /quartus/fitter/fitcc/fitcc_periph_to_core_routing_solver.cpp, Line: 59 Description Due to a problem in the Intel® Quartus® Prime Pro Edition software version 17.0 and earlier, you may see this internal error at the fitter stage. Resolution To work around this problem, change the following fitter setting: Assignments > Settings > Compiler Settings > Advanced Settings (Fitter) and set Periphery to Core Placement and Routing Optimization -> OFF This problem is fixed beginning with the Intel Quartus Prime Pro Edition software version 17.1 Custom Fields values: ['novalue'] Troubleshooting 482518 439585 454107 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 17.1 17.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']