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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
One to Four Demultiplexer
The interactive 1 to 4 Demultiplexer digital logic circuit, with Boolean function and truth table
Click on the board to energize the circuit.
VHDL Program
TRUTH TABLE
Input
Output
E
S
0
S
1
D
0
D
1
D
2
D
3
1
0
0
1
0
0
0
1
1
0
0
1
0
0
1
0
1
0
0
1
0
1
1
1
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
0
FUNCTION TABLE
Input
Output
E
S
0
S
1
D
0
D
1
D
2
D
3
E
0
0
E
0
0
0
E
1
0
0
E
0
0
E
0
1
0
0
E
0
E
1
1
0
0
0
E
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