Forum Discussion
Altera_Forum
Honored Contributor
12 years agoThe negative pins should automatically be connected - providing you have constrained your design correctly. This includes specifying the relevant I/O standards for all the pins in the design. When you specify a differential I/O standard for a pin and assign a pin location (to the positive driver/receiver), Quartus will automatically assign the negative pin for you.
So, I suspect you've not specified a differential I/O standard for the pins you've listed.