Internal Error: Sub-system: PAN, File: /quartus/power/pan/pan_utility_impl.cpp, Line: 644 - Internal Error: Sub-system: PAN, File: /quartus/power/pan/pan_utility_impl.cpp, Line: 644 Description Due to a problem in the Quartus® II software version 11.0 and earlier, this error may be seen when you run PowerPlay Power Analyzer if the project enables vectorless estimation and has any Power Toggle Rate Percentage assignments. A patch is available to fix this problem in the Quartus II software version 10.1. Download and install patch 0.62 from the appropriate link below: Download the version 10.1 patch 0.62 for Windows (.exe) Download the version 10.1 patch 0.62 for Linux (.tar) Download the Readme for the Quartus II software version 10.1 patch 0.62 (.txt) This problem is scheduled to be fixed in a future version of Quartus II software. Related Articles Internal Error: Sub-system: PAN, File: /quartus/power/pan/pan_utility_impl.cpp, Line: 619 Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']