Honored Contributor
Honored Contributor1) There are pins that drive global clocks directly. That is just a location constraint. (The Chip Planner is probably the best place to find those pins). If you don't do this, it will drive local routing to get to the global.
2) Quartus promotes signals to global automatically. If you have a clock and use it as a clock and it's the only one in your design, there's a 99% chance it's already on one. Open the Compilatin Report -> Fitter -> Resource Section -> Global & Other Fast Signals and I'll be you find it there. 3) If you want to make the assignment, open the Assignment Editor, put Clk in the To column, Global Signal for assignment and set it to Global. Compile and repeat 2), but if it's not automatically done in 2) then there's probably a reason this won't work.
