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# Combinational Logic PowerPoint PPT Presentation

Combinational Logic. Outline. 4.1 Introduction 4.2 Combinational Circuits 4.3 Analysis Procedure 4.4 Design Procedure 4.5 Binary Adder- Subtractor 4.6 Decimal Adder 4.7 Binary Multiplier 4.9 Decoders 4.10 Encoder 4.11 Multiplexers. Introduction. Combinational Circuits.

Combinational Logic

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## Combinational Logic

### Outline

• 4.1 Introduction

• 4.2 Combinational Circuits

• 4.3 Analysis Procedure

• 4.4 Design Procedure

• 4.7 Binary Multiplier

• 4.9 Decoders

• 4.10 Encoder

• 4.11 Multiplexers

### Design Procedure

Design Method and Constraint

### Demultiplexer

Decoder Examples

• 3-to-8-Line Decoder: example: Binary-to-octal conversion.

D0 = m0 = A2’A1’A0’

D1= m1 = A2’A1’A0

…etc

### Encoder

z

=

D

+

D

+

D

+

D

1357

The encoder can be implemented

y

=

D

+

D

+

D

+

D

2367

with three OR gates.

x

=

D

+

D

+

D

+

D

4567