NOR Primitive
| Names: | Output Description: | Input Description: | 
|---|---|---|
| NOR2,NOR3,NOR4,NOR6,NOR8,NOR12 | OUT = logical NOR of inputs | IN1, IN2, ...IN12= 2, 3, 4, 6, 8, or 12 inputs | 
Note: In Verilog HDL, you must use the built-in nor gate primitive to
            implement the NOR logic function. Go to Using a Verilog HDL Gate
            Primitive for more information.