Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/altera_arch_common/altera_arch_re_network_routing_constraints.cpp, Line: 1421 - Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/altera_arch_common/altera_arch_re_network_routing_constraints.cpp, Line: 1421 Description Due to a problem in Intel® Quartus® Prime Pro Edition Software version 22.4, you might see this internal error during the Fitter stage. This problem only occurs when targeting Intel® Arria® 10 devices. Resolution To work around this problem, change the following fitter setting: Go to Assignments > Settings > Compiler Settings > Advanced Settings (Fitter). Set Periphery to Core Placement and Routing Optimization -> OFF. This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition Software version 23.2. Custom Fields values: ['novalue'] Troubleshooting 15013076479 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 23.2 22.4 ['Arria® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']