Internal Error: Sub-system: CUT, File: /quartus/db/cut/cut_atom_io.cpp, Line: 10493 - Internal Error: Sub-system: CUT, File: /quartus/db/cut/cut_atom_io.cpp, Line: 10493 Description Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 20.1, you may see this Internal Error when you connect the "pll_ref_clk" port of External Memory Interfaces Intel® Stratix® 10 FPGA IP to an unsupport clock source such as Clock Source BFM Intel® FPGA IP. Resolution To avoid this error, drive the "pll_ref_clk" from the external clock pin directly. Custom Fields values: ['novalue'] Troubleshooting 1509115430 False ['External Memory Interfaces Arria® 10 FPGA IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 22.4 20.1 ['Arria® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']