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UNIVERSAL GATES
VHDL
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ARITHMETIC CIRCUITS
Four Bit Adder-Subtractor
4-bit Signed Comparator
BCD Adder
4X4 Multiplier Circuit
ADDERS
Half-Adder
Full-Adder
SUBTRACTORS
Half-Subtractor
Full-Subtractor
DECODERS
BCD-to-Excess-3 Code Converter
One-Two-Decoder
Two-Four-Decoder
Two-Four-Decoder Enable Input
Three to Eight Decoder
MULTIPLEXERS
Two-to-One Multiplexer
Four-to-One Line Multiplexer
Quadruple Two-to-One Line Multiplexer
One-to-Four Demultiplexer
ENCODERS
Four Input Priority Encoder
Two to Four Decoder With Enable Input
The interactive 2 to 4 Decoder With Enable Input digital logic circuit, with Boolean function
Click on the board to energize the circuit.
VHDL Program
TRUTH TABLE
Input
Output
E
A
1
A
0
D
0
D
1
D
2
D
3
0
0
0
0
1
1
1
0
0
1
1
0
1
1
0
1
0
1
1
0
1
0
1
1
1
1
1
0
1
X
X
1
1
1
1
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