Error: Error during execution of script generate_ed.tcl: <example design>: Interface seq_debug tried to export unknown interface if0.seq_debug - Error: Error during execution of script generate_ed.tcl: <example design>: Interface seq_debug tried to export unknown interface if0.seq_debug Description Due to a problem in the Quartus® II software version 12.1 and later, this error message may appear when generating the example design for the DDR3 controller with UniPHY if the EMIF On-Chip Debug Toolkit interface type is set to Internal (JTAG). Resolution The workaround is to change the on-chip debug setting from Internal (JTAG) to Shared . This generates an Avalon® slave interface, which does not need to be connected. This issue has been fixed in Intel® Quartus® Prime Software version 13.0. Custom Fields values: ['novalue'] Troubleshooting 2205798139 False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 13.0 12.1 ['Arria® II GZ FPGA', 'Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Stratix® III FPGAs', 'Stratix® IV E FPGA', 'Stratix® IV GT FPGA', 'Stratix® IV GX FPGA', 'Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']