XNOR Primitive
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                         Names:  | 
                         Description:  | 
|---|---|
| 
                         XNOR  | 
                         OUT = logical exclusive NOR of inputs IN1 and IN2  | 
Note:  In Verilog HDL, you must use the built-in xnor gate primitive to
            implement the XNOR logic function. Go to Using a Verilog HDL Gate
            Primitive for more information.