05-06-2013, 03:21 PM
VHDL & DIGITAL CIRCUIT DESIGN :THE BRIEF DESCRIPTION
VHDL & DIGITAL.ppt (Size: 2.03 MB / Downloads: 32)
INTEGRATED CIRCUITS
Integrated Circuits (IC) Meaning That All The Components In This Circuits Are Fabricated On The Same “Chip”.
ICs Have Become A Vital Part Of Modern Electronics Circuits Design.
They Are Used In The Computer Industry, Automobile Industry, Home Appliances, Communication And Control Systems.
ICs Are Of Two Basic Types :
Digital IC’s
Linear IC’s
DIGITAL IC’S
Digital IC’s Are Complete Functioning Logic Network That Equivalents Of Basic Transistor Logic Circuits.
They Are Used To Form Such Circuits As Gate,coutner,mux, Demux, Register,etc.
Digital Circuits Concerned With Only Two Levels Of Voltage “High” And “Low”.
Digital Ckts Are Easy To Design And Produce In Large Quantities As Low Cost Devices.
LINEAR IC’S:
Linear IC’s Are Equivalent Of Discrete Transistor Networks Such As Amplifier,Filter,Frequency Multipliers And Modulators.
It Requires Extra Components for Satisfactory Operations.
In Linear Ckts The Output Of Electrical Signals Vary In Proportion To The Input Signals Applied.
Linear Ckts Are Also Referred To As Analog Circuits.
MOORE’S LAW
Moore Who Is Known As “ Father Of Printer”.
In 1970 Moore Gave The Law Which Is Known As Moore’s Law.
It’s State That “ After Each 18\24 Months The Number Of Components Is Doubled In IC's .
For Example Intel Processor P4 After Two Years Later Comes Core 2 Dual ,But Processor Dual Core Comes In Just Sixth Months Later So The Average Is 18 Months.
INTRODUCTION to vlsi
VLSI Is A Process Of Integration Of Millions Of Transistor In A Single Chip .Vlsi Design Involves All Aspects Of Creating An IC's.
Vlsi Design Process Is Classified Into Two Categories . Front End And Back End .
In Front End Vlsi Design Process A Design Engineer Performs All Aspects Of Design Before Handling The Design.
In Back End Vlsi Design Process Tasks Performed By Design Engineers Are-
(A) MASK GENERATION (D)testing
(B)wafer PROCESSING (E)delivery OF SAMPLES
©packaging (F)final MASS PRODUCTION
Behavioral Model:
The Behavioral Style Of Modeling Specifies The Behavioral Of An Entity As A Statements That Are Executed Sequentially In The Specified Order.
All Statements Which Are Specified Inside A Process Statement, Do Not Clearly Specifies The Structure Of The Entity But Merely Its Functionality.
A Process Statement Is A Concurrent Statement That Can Appear With In An Architecture Body.
STRUCTURE ARCHITECTURE:
In The Structure Style Of Modeling An Entity Is Described In Terms Of Its Components And Their Interconnections.
A Structure Model Does Not Tell About The Functionality Of The Entity.
A Structure Description Is Easiest To Be Synthesized.
The Architecture Body Is Composed Of Two Parts:
The Declaration Part (Before The Keyword Begin)
The Statement Part (After The Keyword Begin).
Half Adder Is Such Type Of Structure Architecture.