Error 13264: Can’t resolve multiple constant drivers - Error 13264: Can’t resolve multiple constant drivers Description Due to a problem in the Quartus® Prime Pro Edition Software version 18.0 and later, you may observe this error during the synthesis compilation phase. Resolution To work around this problem, add global_assignment ENABLE_STATE_MACHINE_INFERENCE OFF in the Quartus Settings File ( .qsf ). This problem is fixed starting with the Quartus® Prime Pro Edition Software version 19.3. Custom Fields values: ['novalue'] Troubleshooting 1409062826 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.3 18.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']