CSC270 Python Operators for Simulation

--D. Thiebaut 10:09, 2 March 2012 (EST)

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Source (Python V. 2.7)

# demonstration of Python operators for
# simulating boolean logic with 0s and 1s
#


def NOT( a ):
    return 1-a

def NAND( a, b ):
    return NOT( a & b )

def NOR( a, b ):
    return NOT( a | b )

def XNOR( a, b ):
    return NOT( a ^ b )

def decoder( msb, lsb ):
    outputs = [0, 0, 0, 0]
    index = msb*2 + lsb
    outputs[ index ] = 1
    return outputs

def mux( I0, I1, I2, I3, c1, c0 ):
    index = c1 * 2 + c0
    if index == 0: return I0
    if index == 1: return I1
    if index == 2: return I2
    if index == 3: return I3
    
a = 1
b = 0

print "a = ", a 
print "b = ", b , "\n"
print "AND:  a & b = ", a & b, "  a & a = ", a & a, "\n"
print "OR:   a | b = ", a | b, "  a | a = ", a | a, "\n"
print "XOR:  a ^ b = ", a ^ b, "  a ^ a = ", a ^ a, "\n"
print "NOT:  NOT( a ) = ", NOT( a ), " NOT( b ) = ", NOT( b ), "\n"
print "NAND: NAND( a , b ) = ", NAND( a , b ), "\n"
print "NOR:  NOR( a , b ) = ", NOR( a , b ), "\n"
print "XNOR: XNOR( a, b ) = ", XNOR( a, b ), "\n" 
print "DECODER: decoder( a, b ) = ", decoder( a, b ), "\n"
print "MUX:     mux( 1, 0, 1, 1, a, b ) = ", mux( 1, 0, 1, 1, a, b ), "\n"

Output

# OUTPUT:

a =  1
b =  0 

AND:  a & b =  0   a & a =  1 

OR:   a | b =  1   a | a =  1 

XOR:  a ^ b =  1   a ^ a =  0 

NOT:  NOT( a ) =  0  NOT( b ) =  1 

NAND: NAND( a , b ) =  1 

NOR:  NOR( a , b ) =  0 

XNOR: XNOR( a, b ) =  0 

DECODER: decoder( a, b ) =  [0, 0, 1, 0] 

MUX:     mux( 1, 0, 1, 1, a, b ) =  1