The NOT-OR operation is known as the NOR operation. The following figure shows 2-input OR gate followed by a NOT gate. The standard symbol of the NOR gate is shown in following diagram. A bubble on the output side of the NOR gate represents the NOT operation.
The operation of this circuit can be described in the following way:
The output of the OR gate Y' can be written as
Y' = A + B + ... + N
and the output of the NOT gate (Y) can be written as
_ ____________
Y = Y' = A + B + ... + N
The logic operation represented by above equation is known as NOR operation.
The three basic logic operations, AND, OR and NOT can be performed by using only the NOR gates. These are shown in following diagram.
The operation of this circuit can be described in the following way:
The output of the OR gate Y' can be written as
Y' = A + B + ... + N
and the output of the NOT gate (Y) can be written as
_ ____________
Y = Y' = A + B + ... + N
The logic operation represented by above equation is known as NOR operation.
The three basic logic operations, AND, OR and NOT can be performed by using only the NOR gates. These are shown in following diagram.
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