Error (21075): The core supply voltage value of '0.9V' is illegal for the currently selected part. - Error (21075): The core supply voltage value of '0.9V' is illegal for the currently selected part. Description You may see this error when you migrate an existing design targeting a Stratix® V device to the Quartus® II software version 12.0. The error message may be issued for values of '0.9V' or '0.85V'. This error occurs because the Stratix V device family does not support the assignment NOMINAL_CORE_SUPPLY_VOLTAGE beginning with the Quartus II software version 12.0. Resolution To avoid this error, edit the Quartus II Settings File ( .qsf ) for your project and delete the following assignment: set_global_assignment -name NOMINAL_CORE_SUPPLY_VOLTAGE <0.85 or 0.9V> Save the .qsf and recompile your project. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.0 ['Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']