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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.

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Presentation Transcript

Outline
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




















Carry lookahead adder 1 7
Carry gateLookahead Adder (1/7)



Combinational logic

Carry gateLookahead Adder (3/7)






Bcd adder
BCD Adder gate






Decoder
Decoder gate




Combinational logic

Decoder Examples gate

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

D0 = m0 = A2’A1’A0’

D1= m1 = A2’A1’A0

…etc



Encoder
Encoder gate

z

=

D

+

D

+

D

+

D

1 3 5 7

The encoder can be implemented

y

=

D

+

D

+

D

+

D

2 3 6 7

with three OR gates.

x

=

D

+

D

+

D

+

D

4 5 6 7


Encoder1
Encoder gate