Digital Logic Design (DLD)EE-232

Lecture No. 01

Prepared by: Engr. Shafaq Ejaz

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Lecture Contents

• Class Introduction• Discussion on Marks Distribution• Discussion on Lecture Plan• Subject Introduction / Lecture Topic

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DLD Marks Distribution

DLD Lecture Plan

WHAT IS DLD?

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DIGITAL LOGIC DESIGN

Any system based on discontinuous data or events.

The science that investigates the principles governing correct or reliable inference.

من طق

دالئل

The creation of a plan or convention for the construction of an object or a system.

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Lecture Topic

Introduction to Digital Computer and Digital Systems

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Digital Logic

Electronic Systems

Digital Systems

CalculatorsComputers Telephones

Analog Systems

Binary Code

The physical quantities

or signals may vary

continuously over a

specified range.

The physical quantities or signals can assume only discrete values.

Applications of Digital System

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Digital SystemDigital Logic

Traffic Control

Space Guidance

Medical Treatment

Transactions

Commercial

InternetWeather

Monitoring

Business

communication

Industrial

Scientific Enterprises

How Digital System Work?

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Digital System

InformationProgram

Signal

Digital Computers

General Purposes Digital Computers

Discrete Information Processing System

Analog to Digital Conversion

Continuous Process into Discrete ProcessExample of Employee’s Pay bill

Scientist Quantizes his Continuous data

Physical System

Mathematical Modelling

Simulation in a Analog Computer

Simulation in a Digital Computer

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Digitization Benefit: An Example Let bit encoding be: 1 V= “01” , 2 V = “10” , 3 V =“11”

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Analog Signal Digitized Signal

A/D D/A

Can fix easily distinguish 0s and 1s, restore

How fix -- higher, lower,?

lengthy transmission(e. g., cell phone)

lengthy transmission(e. g., cell phone)

Digitized signal not perfect re-creation, but higher sampling rate and more bits per encoding brings closer.

Analog vs. Digital Systems

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1. In Analog System voltage levels not saved/copied/transmitted Perfectly.

2. Analog signal (e.g., audio) may lose quality.

1. Digitized version enables near perfect saved/copied/transmitted.

1. Greater accuracy2. Efficient Processing & Data

Storage3. Efficient & Reliable Transmission4. Detection and Correction of Errors5. Precise & Accurate Reproduction6. Easy Design and Implementation7. Occupy minimum space8. Two States, Two Voltage Levels

On/OffBlack/WhiteHot/ColdStationary/Moving

Analog Signal Digital Signal

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Digital Computer

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Control UnitProcessor

orArithmetic Unit

Storageor

Memory Unit

Input Devices&

Control

Output Devices&

Control

Stores Programs as well as I/p, o/p & intermediate data prepared by the user.

Performs arithmetic & other data processing tasks as a specified by the program.

Supervises flow of information between various units.

CPU: In small ICs referred as Microprocessor

Mini Computer

Q?

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