Can physical global clock pins be overridden by the assignment editor?

Physically, the global clock networks can be driven by dedicated clock pins, by PLLs or by user logic.

They can not be driven by regular I/O pins.

However, since they can be driven by users logic, there's a possible work around.

Instead of assigning "signal_I_wish_to_be_global" to pin XX11, use

lcell helper_cell (.in(helper_signal) .out(signal_I_with_to_be_global))

and assign "helper_signal" to pin XX11 instead.

This will increase the pin to signal delay, but it will allow Quartus to use a global network.