Lec01 digital design

8/4/2019 Lec01 digital design

1/17

CS221:DigitalDesign

Dr.A.Sahu

De t of Com . Sc. & En .

IndianInstituteofTechnologyGuwahati

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, ,

Whatdowestudyinthiscourse?

Why

should

this

be

studied? Howisthecoursestructured?

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tten ance

s

an atory

1

Take

homeAnykindofCopy/Plagiarism leadto`F

Grade

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BooleanAlgebra,LogicMinimizationand

realization Flipflops,registers,counters,Finitestatemodel

Synthesisofsynchronoussequentialcircuits

point;

on,su rac on,mu p ca onan divisionofnumbers.

Currenttrendsindigitaldesign:ASIC,FPGA..4


5/17

TextBook a ran , g ta es gn, rev ew t on,

WileyIndiaPvt Ltd,2010

. . . , ,4/e,PearsonEducation,2007.

References R.H.KatzandG.Boriello,ContemporaryLogicDesign,2/e,

PrenticeHallofIndia,2009.

A.P.Malvino,D.P.LeachandG.Saha,DigitalPrinciplesand

, , , . S.C.Lee,DigitalCircuitsandLogicDesign,PrenticeHallofIndia,

2006.

. . , , ,HallofIndia,2008.

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Web marks timin venue Coursewebsite:~. . .

Markdistribution

25%:3Prog.Assignment+2Quiz+Homewor

35%:MidSemester40%:EndSemester

ClassTiming&Venue

Venue:1201,Timing:SlotB

Mon:910,Tue:1011,Wed:1112,Otheronehourismakeupslot

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Basicprinciplebehinddigitalsystem

Efficientdesignandreuse.

Interfacin withexternalworld Workingofcomponentsinsidea

Analogvs digital

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Lookunderthehoodofcomputers

Solidunderstanding >confidence,insight,evenbetterprogrammerwhenawareofhardware

resourceissues

Electronicdevicesbecomingdigital

Ena e ys rin ingan morecapa ec ips

Enables:

Betterdevices:Bettersoundrecorders,cameras,, , ,...

Newdevices:Videogames,PDAs,...

Knownasembeddedsystems

Thousandsofnewdeviceseveryyear

Designersneeded:Potentialcareerdirection

Portablemusic la ers

Satellites

Cell hones

DVDplayers

Videorecorders

Musicalinstruments

Cameras TVs ???

1995 1997 1999 2001 2003 2005 2007


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devices

Anotherviewofacomputer:controller+datapath

Parallelcomputationbeyond61C

Furtheringourunderstandingofcomputation

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10/17

Whatisdigital?

Digital

camera,

Digital

TV,

Digital

Watch,

Digital

Radio,DigitalCity(ecity),DigitalPhotoFrameetc

Whichgivesthethingsincountableform

Scene(analog) toImage(digital)

Whydigital?

Countableform,makeseasytomanage

Easymanagementmakesmoreusefulandversatile

What di it ?

Howtocount:Decimaldigit:0to9 10


11/17

WhatDoesDigitalMean?1.2

Analogsignal Infinitepossiblevalues

Digital signal Finite possible values

created

by

microphoneSound waves

keypad

which moves

the magnet,

move t emembrane, 3 421

2 digitalsignal

microphone

which createscurrent in the nearby wir

analogsignal

4Possiblevalues: Possiblevalues:

valu

valu

0

1

23

. , . , . ,

...infinitepossibilities, , , ,or .

Thatsit.

11

time time


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=

, ,

DecimalSystem:0 9

ayevo ves: ecause uman ave nger

RomanSystemMayevolvestomakeeasytolookandfeel

Pre/PostConcept:(IV, V &VI)is(51,5&5+1)

BinarySystem,Others(Oct,Hex)

Onecancutana leintotwo

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Whatisdesign? ,

Whilemeetingquantitative(size,cost,power)andqualitative(beauty,elegance)

W atis ogic esignChoosedigitallogiccomponentstoperformspecified

control datamani ulation orcommunicationfunctionandtheirinterconnection

Whichlogiccomponentstochoose?

components,programmabledevices,individualtransistorsonachip,etc.)

constraints13


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DigitalSignalswithOnlyTwoValues:

Binary Binarydigitalsignal onlytwo

poss eva ues

Typicallyrepresentedas0 and1 value

ne nary g t sa t

Wellonlyconsiderbinarydigitalsignals

time0

nary spopu ar ecause Transistors,thebasicdigitalelectric

component,operateusingtwo voltages

Storing/transmittingoneoftwo valuesiseasierthanthreeormore(e.g.,loudbeepor uiet bee reflection or no reflection


15/17

Exam le

of

Di itization

Benefit Analogsignal(e.g.,audio)maylosequality

Voltagelevelsnot Volts

2

3

nsmission

phone)

2

3

saved/copied/transmitted

perfectly Digitizedversionenables

nearperfectsave/cpy/trn.

time0

1 originalsignallength

ytra

(e.g

,cell

time0

1 receivedsignalHowfix higher,lower,?

Samplevoltageatparticularrate,savesampleusingbitencoding

Voltagelevelsstillnotkeptrans

mission

llphone)

Vo

lts

di itized si nal

a2d

1

a

perfectly

Butwecandistinguish0sfrom1s le

ngthyt

(e.g,

c

time0

time

Canfix easilydistinguish0s

0

01 10 11 10 11

Volts

3

d2aLet

bit

encoding

be:

1V:01

2V:10

3V:11

and1s,restoreDigitizedsignalnot

perfectrecreation,

buthighersampling

time0

1

ra ean more sper

encodingbringscloser.


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ComplicatedCircuit(Processor,Memory)

IC,MSI,LSI,VLSI,ULSI

Design,Model,Simulate,Validate,Test

, ,

VHDL/Verilog Simulation

Sc ematicE itor EmbeddedSystem(Area,Power,Cost)

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Thanks

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Lec01 digital design

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