Error: Can't place multiple pins assigned to pin location - Error: Can't place multiple pins assigned to pin location Description You may observe this error message if you have a signal in your design that has been assigned to a Dual-Purpose pin, but you have not changed the appropriate Dual Purpose Pins setting in the Quartus® II software to enable this. Resolution To solve this, go to Assignments -> Device... -> Device and Pin Options ... -> Dual-Purpose Pins , and change the value of the appropriate pin to Use as regular I/O . Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']