TABLE 3-2 Truth Table for Code Converter Example

T-28

Truth Table for Code Converter Example

TABLE 3-2 Truth Table for Code Converter Example

Decimal Digit

Input BCD

Output Excess-3

ABCD

WXYZ

0

0000

0 011

1

0001

0 100

2

0010

0 101

3

0011

0 110

4

0100

0 111

5

0101

1 000

6

0110

1 001

7

0111

1 010

8

1000

1 011

9

1001

1 100

LOGIC AND COMPUTER DESIGN FUNDAMENTALS Mano & Kime

1997 by Prentice-Hall, Inc. Simon & Schuster / A Viacom Company Upper Saddle River, New Jersey 07458

T-29

Truth Table for BCD?to?Seven-Segment Decoder

TABLE 3-3 Truth Table for BCD?to?Seven-Segment Decoder

BCD Input

Seven-Segment Decoder

ABCD

ab c d e f g

0000 0001 0010 0011 0100 0101 0110 0111 1000 1001

All other inputs

11 1 1 1 1 0 01 1 0 0 0 0 11 0 1 1 0 1 11 1 1 0 0 1 01 1 0 0 1 1 10 1 1 0 1 1 10 1 1 1 1 1 11 1 0 0 0 0 11 1 1 1 1 1 11 1 1 0 1 1

00 0 0 0 0 0

LOGIC AND COMPUTER DESIGN FUNDAMENTALS MANO & KIME

1997 by Prentice-Hall, Inc. Simon & Schuster / A Viacom Company Upper Saddle River, New Jersey 07458

T-30

Truth Table for 3?to?8-Line Decoder

Inputs

D7

D6

D5

D4

D3

D2

D1

D0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

0

Outputs

A2

A1

A0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

LOGIC AND COMPUTER DESIGN FUNDAMENTALS Mano & Kime

1997 by Prentice-Hall, Inc. Simon & Schuster / A Viacom Company Upper Saddle River, New Jersey 07458

T-31

Truth Table for Octal-to-Binary Encoder

Inputs

D7

D6

D5

D4

D3

D2

D1

D0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

0

Outputs

A2

A1

A0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

LOGIC AND COMPUTER DESIGN FUNDAMENTALS Mano & Kime

1997 by Prentice-Hall, Inc. Simon & Schuster / A Viacom Company Upper Saddle River, New Jersey 07458

T-32

Truth Table of Priority Encoder

TABLE 3-6 Truth Table of Priority Encoder

Inputs

D3

D2

D1

D0

0

0

0

0

0

0

0

1

0

0

1

X

0

1

X

X

1

X

X

X

Outputs

A1

A0

V

X

X

0

0

0

1

0

1

1

1

0

1

1

1

1

LOGIC AND COMPUTER DESIGN FUNDAMENTALS Mano & Kime

1997 by Prentice-Hall, Inc. Simon & Schuster / A Viacom Company Upper Saddle River, New Jersey 07458

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