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Example XNOR gate.

Behavior

The XNOR (Nexclusive OR) outputs the result of the XNOR function of the 1-bit signals at the inputs. The output has the value 1 only if not exactly one input has the value 1. For an XNOR gate with two inputs, this means that the output is 1 if both inputs have the same value.

Unconnected inputs always have the value 0.

Table 1. truth table
0 1 Z X

0

1

0

1

X

1

0

1

1

X

Z

1

1

1

X

X

X

X

X

X

(Z: Undefined/High impedance, X: Error)

Mnemonics

The logical gates of Antares can illustrate their function with so-called "mnemonics". See the chapter Descriptions and explanations. The mnemonic of the XNOR gate is shown below.

Example Mnemonic

Pins

Inputs

The 1-bit inputs of the XNOR gate. Their number is determined by the attribute "Number of inputs".

Output

The 1-bit output of the XNOR gate. Outputs the value of the calculated XNOR function.

Attributes

Orientation

The direction in which the output points.

Number of inputs

Determines how many inputs the XNOR gate has. There are 2 to max. 8 inputs available. If the XNOR gate is already connected to wires, this attribute cannot be changed.

Output name

The optional name displayed next to the output. This can be useful when the XNOR gate forms the end of a complex combinatorial circuit and the logical expression produced by the XNOR gate is to be specified.