4.3 Assign Global Input Pins

During this fitting step, the fitter evaluates whether global resources are used in the design. Global input pins—such as clock, reset, or output enable signals—are assigned first, if defined in the design. Any remaining Global input pins are then assigned to user-specified input signals defined by the dedicated input strategy. If global input pins remain unassigned, or if a dedicated input strategy is not specified, input signals are assigned to these pins based on their frequently of use within the design.