Error (175020): Illegal constraint of pin to the region <location> to <location>: no valid locations in region - Error (175020): Illegal constraint of pin to the region <location> to <location>: no valid locations in region Description You will encounter the following Quartus® II Fitter error with Stratix® V GX devices if you assign signals to transceiver pins without also connecting these pins to a transceiver PHY instance in your design. Error (175020): Illegal constraint of pin <pin name> to the region <location> to <location>: no valid locations in region Resolution Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.1.1 ['Stratix® V FPGAs', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']