Electronics.ppt on vlsi design and you can refer it

this is my first ppt on vlsi report thank you

2. Introduction
What is VLSI?
VLSI(very large-scale integration) is the current level of
computer microchip miniaturization and refers to microchips
containing in the hundreds of thousands of transistor s. LSI
(large-scale integration) meantmicrochips containing
thousands of transistors.
What is the Use of VLSI?
VLSI APPLICATION. VLSI stands for Very Large Scale
Integration. It's used in creating so many chips and circuits
on a single mini chip of silicon.

3. Introduction
Requirements study
specification
implementation
validation
What do I have to design?
How do I do it?
Have I implemented
What I intended to?
About any design..
market

4. VLSI SYSTEM DESIGN FLOW
V. ANURADHA
VLSI Design cycle:
VLSIdesigncyclestartwithaformal
specificationofaVLSIchip,follows
aseriesofsteps,andeventually
producesapackagedchip.

5. Simplified VLSI Design Flows
System Specification
Functional
(Architecture) Design
Functional Verification
Logic Design
Logic Verification
Circuit Design
Circuit Verification
Physical Design
Physical Verification
Front End
Back End
Synthesis Phase
Layout Phase
Circuit
Representation
Layout
Representation
Behavioral
Representation
Logic(Gate-Level)
Representation

6. VLSI SYSTEM DESIGN FLOW
V. ANURADHA
Four Levels of Design Representation
Behavioral
Representation
Logic (Gate-Level)
Representation
Circuit
(Transistor-Level)
Representation
Layout
Representation
Functional Blocks, FSM
Logic Blocks, Gates
Transistor Schematics
Physical Devices

7. VLSI Design flow
VLSI SYSTEM DESIGN FLOW
V. ANURADHA

8. Design Methodology
There are two basic types of digital design
methodologies
Top-Down design methodology
Bottom-Up design methodology
Top-DownDesign Methodology
Define top-level block and identify the sub-
blocks
divide sub-block until we come to leaf cells

9. Design Methodology
Bottom-Up Design Methodology
identify building block that are available for us
build a bigger cells using these block
continue build a cell until we build top level
the
A combination of Top-Down and Bottom-Up
design are used in today’s digital design
top-level

10. Top-Down Design Methodology
VLSI SYSTEM DESIGN FLOW
V. ANURADHA
Top Level Block
Sub Block 1 Sub Block 1Sub Block 1
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell

11. Bottom-Up Design Methodology
Top Level Block
Macro Cell 1 Macro Cell 3Macro Cell 2
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell

12. Simplified view of VLSI design Flow
Top Down
(algorithm
Bottom Up
(physical)

13. Y-Chart

14. System Specification
Firststepofdesignprocessistolaydown
thespecificationofthesystem.
Highlevelrepresentationofthesystem.
Factorsconsidered:
Performance,Functionality,Physical
dimension,Design technique,Fabrication
technology
Itisacompromisebetweenmarket
requirements,technologicalandeconomical
viability.

15. System Specification
The end results are specifications of
Size,Speed,PowerandFunctionality
oftheVLSIsystem
Basicarchitecture

16. Functional Design
Mainfunctionalunits,Interconnectrequirements
ofthesystemareidentified
Thearea,powerandotherparametersofeachunit
areestimated
Thekeyideaistospecifybehavior,intermsof
Input,Output,Timingofeachunit
The outcomeof functional design is usually a
timing diagram
This information leads to improvement of the
overall design process and reduction of
complexityof the subsequent phases

17. Logic Design
Designthelogic,thatis,
Booleanexpressions,wordwidth,registerallocation,
etc.
TheoutcomeiscalledanRTL(RegisterTransfer
Level)description.RTLisexpressedinaHDL
(HardwareDescriptionLanguage),suchasVHDL
andVerilog.

18. Circuit Design
 The purpose of the circuit design is to develop a
circuit representation based on the logic design.
 The Boolean expression can be converted into a
circuit representation by taking into consideration
the speed and power requirements of the original
design.
 Design the circuit including gates, transistors,
interconnections, etc. The outcome is called a
netlist.
 Circuit simulation is used to verify the correctness
and timing of component

19. Physical Design
Givenacircuitafterlogic
synthesis,toconvertitintoa
layout

20. Overall design process