Exclusive NOR

Speed Key Name: xnor

 

Signal name and type

Description

Digital inputs: <i1> through <i999>

The digital input states that will be XNOR'd together to determine the state of <out>, as follows:

If two inputs are defined, <out> will go high if the state of both inputs is identical.

If more than two inputs are defined, <out> will go high if the number of inputs that are high is even, or if all the inputs are low simultaneously. Otherwise, the output is low.

The Exclusive NOR symbol can be expressed using a truth table, where low stands for logical 0 (false), and high stands for logical 1 (true).

Truth table for two-input Exclusive NOR:

<i1>       <i2>   

<out>

low         low

high

low         high

low

high        low

low

high        high

high

Truth table for a three-input Exclusive NOR:

<i1>     <i2>       <i3>

<o1>

low        low        low

high

low        high       low

low

high       low        low

low

high       high       low

high

low        low        high

low

low        high       high

high

high       low        high

high

high       high       high

low

Digital output: <out>

Indicates the result of the XNOR operation.

High/1 = 2 inputs identical, or even number of inputs HIGH

See also Exclusive OR