2.6.1. Pin Assignment
You do not need to specify pin assignments for simulation. However, you should make the pin assignments before you compile. Pin assignments provide direction to the Fitter and specify the signals that should be assigned to device pins. While compiling only the IP core, you can create virtual pins to avoid making specific pin assignments for top-level signals. When you are ready to map the design to hardware, you can change to the correct pin assignments.
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