VLSI refers to microchips containing hundreds of thousands of transistors. The VLSI design process begins with specifying the system and identifying functional units. Logic design then expresses the system using a hardware description language. Circuit design develops a circuit representation from the logic. Physical design converts the circuit into a layout, completing the design process from specification to packaged chip.
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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) meant microchips 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.
4. VLSI Design cycle:
VLSI design cycle start with a formal
specification of a VLSI chip, follows
a series of steps, and eventually
produces a packaged chip.
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
8. Design Methodology
There are two basic types of digital design
methodologies
Top-Down design methodology
Bottom-Up design methodology
Top-Down Design 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 1
Sub Block 1
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
Leaf
Cell
14. System Specification
First step of design process is to lay down
the specification of the system.
High level representation of the system.
Factors considered:
Performance,Functionality,Physical
dimension,Design technique,Fabrication
technology
It is a compromise between market
requirements, technological and economical
viability.
15. System Specification
The end results are specifications of
Size,Speed,Power and Functionality
of the VLSI system
Basic architecture
16. Functional Design
Main functional units, Interconnect requirements
of the system are identified
The area, power and other parameters of each unit
are estimated
The key idea is to specify behavior, in terms of
Input,Output,Timing of each unit
The outcome of functional design is usually a
timing diagram
This information leads to improvement of the
overall design process and reduction of
complexity of the subsequent phases
17. Logic Design
Design the logic, that is,
Boolean expressions,word width, register allocation,
etc.
The outcome is called an RTL (Register Transfer
Level) description. RTL is expressed in a HDL
(Hardware Description Language), such as VHDL
and Verilog.
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