Internal Error: Sub-system: STA, File: /quartus/h/sta_timer_engine_sys.h, Line: 472 - Internal Error: Sub-system: STA, File: /quartus/h/sta_timer_engine_sys.h, Line: 472 Description Due to a problem in the Intel® Quartus® Prime Pro Edition Software v21.2, you may see this error in the Timing Analysis stage when you use the "report_cdc_viewer" command in a .sdc file. Resolution To work around this problem, do not use "report_cdc_viewer" in your .sdc files. The "report_cdc_viewer" command should be used directly in the Timing Analyzer GUI. This problem is fixed beginning with the Intel Quartus Prime Pro Edition Software v21.3. Custom Fields values: ['novalue'] Troubleshooting 18017650704 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 21.3 21.2 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']