Honored Contributor
Honored ContributorIt appears you can't use these pins and, I think, the pin planner diagram 'shows' why. I'd suggest those two pins are too far away from each other.
Without the pin assignments my trial project compiles successfully. Add the two clock pins you've specified and it does not. However, removing one pin assignment (or the other) results in success. Specifying pins AB34 & AC34 (two global clocks on pins located close together) works. Alternatively, leave AF6 in and Quartus chooses pin AC6. So, I'd suggest the device does not have routing resource available to direct a global clock input to a clock control block located on the other side of the fabric. Cheers, Alex
