Description
You may see this warning in Intel® Quartus® Prime Software when you have assigned a single-ended dedicated clock output to the n-pin of a differential pin pair in Intel MAX® 10 devices.
Resolution
For a single-ended dedicated clock output, assign the pin to PLL#_CLKOUTp.
For a differential dedicated clock output, assign the pin pair to PLL#_CLKOUTp and PLL#_CLKOUTn.