Internal Error: Sub-system: QHD, File: /quartus/comp/qhd/qhd_database_utils_splitter.cpp, Line: 806 - Internal Error: Sub-system: QHD, File: /quartus/comp/qhd/qhd_database_utils_splitter.cpp, Line: 806 Description Due to a problem in the Quartus® Prime Pro Edition software version 18.1, you may see this internal error when you have illegal global clock assignments in your Quartus Settings File (.qsf). Resolution To work around this problem, remove the global clock assignments. Custom Fields values: ['novalue'] Troubleshooting 601758 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] No plan to fix 18.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']