Warning: DQ I/O pins fed by DQS I/O pin assigned different I/O standards - Warning: DQ I/O pins fed by DQS I/O pin assigned different I/O standards Description After running the pin_assignments.tcl and performing compilation, you will get a warning as below: Warning (181009): DQ I/O pins fed by DQS I/O pin "I/O pad mem_dqs[*]" assigned different I/O standards -- it is recommended that all DQ I/O pins fed by the same DQS I/O pin have the same I/O standard This is because legality checks don't understand that differential and single-ended I/O standards are the same. Resolution This issue has been fixed in Intel® Quartus® Prime Software version 13.0. Custom Fields values: ['novalue'] Troubleshooting 1408184322 False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 13.0 12.1 ['Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA'] ['novalue'] ['novalue'] ['novalue']