XNOR Gate
Information
A digital XNOR (exclusive-NOR) gate is the complement of the XOR gate. It outputs a logic high (1) only if its inputs are equal — both 0 or both 1. It performs the logical equivalence operation.
The truth table for a 2-input XNOR gate is:
In1 |
In2 |
Out |
|---|---|---|
0 |
0 |
1 |
0 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
1 |
Ports
In1: First digital input
In2: Second digital input
Out: Digital output (result of NOT(In1 XOR In2))
Model
The XNOR model implements a standard 2-input digital XNOR logic gate.
A digital XNOR gate outputs logic 1 only when both inputs are equal.
Attributes:
In1 (dsignal): First input digital signal
In2 (dsignal): Second input digital signal
Out (dsignal): Output digital signal
Methods:
digital(): Performs the logical XNOR operation:
from pyams.lib import dsignal, model, circuit
class XNOR(model):
""" Digital XNOR gate model """
def __init__(self, In1, In2, Out):
# Digital Signal declarations
self.In1 = dsignal(direction='in', port=In1)
self.In2 = dsignal(direction='in', port=In2)
self.Out = dsignal(direction='out', port=Out)
def digital(self):
""" Perform XNOR operation """
self.Out += ~(self.In1 ^ self.In2)
Command syntax
The syntax for defining an XNOR gate in a PyAMS simulation:
# Import the model
from pyams.models import XNOR
# XNORname: name of the XNOR gate instance
# In1, In2, Out: digital signal ports
XNORname = XNOR(In1, In2, Out)