NOR logic

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This article is about NOR Logic in the sense of building other logic gates using just NOR gates. For information on NOR Gates, see NOR gate. For NOR in the purely logical sense, see Logical NOR. For logic gates generally, see Logic Gate.
a simple NOR gate
a simple NOR gate

Like NAND gates, NOR gates can be combined to form any other kind of logic gate.

Contents

[edit] NOT

This is made by joining the legs of a NOR gate. This is because A and B are always equal, and the NOR will act as an inverter.

Desired Gate NOR Construction
Image:NOR NOT.PNG

[edit] OR

An OR gate is an inverted NOR gate.

Desired Gate NOR Construction
Image:NOR OR.PNG

[edit] AND

Made by connecting two NOT gates to a NOR gate.

Desired Gate NOR Construction
Image:NOR AND.PNG

[edit] NAND

A NAND gate combines an AND gate and a NOT gate.

Desired Gate NOR Construction
Image:NOR NAND.PNG

[edit] XOR

An XOR gate is a combined AND gate and NOR gate, of which both outputs are connected to a NOR gate

Desired Gate NOR Construction
Image:NOR XOR.PNG

[edit] XNOR

An XNOR gate is simply an XOR gate with an inverted output:

Desired Gate NOR Construction
Image:NOR XNOR.PNG

Alternately, an XNOR gate can be constructed using only four NOR gates as follows. Call the two inputs A and B. The first NOR gate is connected to A and B. The second NOR gate is connected to A and the output of the first NOR gate. The third NOR gate is connected to B and the output of the first NOR gate. The fourth NOR gate is connected to the outputs of the second and third NOR gates.

[edit] See also

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