NOT Primitive
| Names | 
                         Output Description:  | 
                     
                         Input Description:  | 
                  
|---|---|---|
                           
                      | 
                     
                        OUT = inverse of input | 
                     IN1= 1 input | 
                  
Note: In Verilog HDL, you must use the built-in 
      not gate primitive to
            implement the NOT logic function. Go to Using a Verilog HDL Gate
            Primitive for more information.