Very-large-scale integration Totally Explained

Everything about Vlsi totally explained

Very-large-scale integration (VLSI) is the process of creating integrated circuits by combining thousands of transistor-based circuits into a single chip. VLSI began in the 1970s when complex semiconductor and communication technologies were being developed. The microprocessor is a VLSI device. The term is no longer as common as it once was, as chips have increased in complexity into the hundreds of millions of transistors.

Overview

The first semiconductor chips held one transistor each. Subsequent advances added more and more transistors, and as a consequence more individual functions or systems were integrated over time. The first integrated circuits held only a few devices, perhaps as many as ten diodes, transistors, resistors and capacitors, making it possible to fabricate one or more logic gates on a single device. Now known retrospectively as "small-scale integration" (SSI), improvements in technique led to devices with hundreds of logic gates, known as large-scale integration (LSI), for example systems with at least a thousand logic gates. Current technology has moved far past this mark and today's microprocessors have many millions of gates and hundreds of millions of individual transistors.
As of early 2008, billion-transistor processors are commercially available, an example of which is Intel's Montecito Itanium chip. This is expected to become more commonplace as semiconductor fabrication moves from the current generation of 65 nm processes to the next 45 nm generations.
At one time, there was an effort to name and calibrate various levels of large-scale integration above VLSI. Terms like Ultra-large-scale Integration (ULSI) were used. But the huge number of gates and transistors available on common devices has rendered such fine distinctions moot. Terms suggesting greater than VLSI levels of integration are no longer in widespread use. Even VLSI is now somewhat quaint, given the common assumption that all microprocessors are VLSI or better.

Structured VLSI design

Structured VLSI design is a modular VLSI design methodology originated by Carver Mead and Lynn Conway for saving microchip area by minimizing the interconnect fabrics area. This is obtained by repetitive arrangement of rectangular macro blocks which can be interconnected using wiring by abutment. An example is partitioning the layout of an adder into a row of equal bit slices cells. In complex designs this structuring may be achieved by hierarchical nesting.
Structured VLSI design had been popular in the early 1980s, but lost its popularity later because of the advent of placement and routing tools wasting a lot of area by routing, which is tolerated because of the progress of Moore's Law. When introducing the hardware description language KARL in the mid' 1970s, Reiner Hartenstein coined the term "Structured VLSI Design" (originally as "Structured LSI Design"), echoing Edsgar Dijkstras structured programming approach by procedure nesting to avoid chaotic spaghetti-structured programs.

Notable VLSI companies

VLSI journals

TVLSI – IEEE Transactions on Very Large Scale Integration (VLSI) Systems

JSSC – IEEE Journal of Solid State Circuits

ED – IEEE Transactions on Electron Devices

TCAD – IEEE Transactions on Computer-Aided DESIGN of Integrated Circuits and Systems

TODAES – ACM Transactions on Design Automation of Electronic System

VLSI conferences

ISSCC – IEEE International Solid-State Circuits Conference

CICC – IEEE Custom Integrated Circuit Conference

ISCAS – IEEE International Symposium on Circuits and Systems

VLSI – IEEE International Conference on VLSI Design

DAC – Design Automation Conference

ICCAD – International Conference on Computer-Aided Design

ESSCIRC – European Solid-State Circuits Conference

ISLPED – International Symposium on Low Power Electronics and Design

ISPD – International Symposium on Physical Design

ISQED – International Symposium on Quality Electronic Design

DATE – Design Automation and Test in Europe

ICCD – International Conference on Computer Design

IEDM – IEEE International Electron Devices Meeting

GLSVLSI – IEEE Great Lakes Symposium on VLSI

ASP-DAC – Asia and South Pacific Design Automation Conference

MWSCAS – IEEE Midwest Symposium on Circuits and Systems

ICSVLSI – IEEE Computer Society Annual Symposium on VLSI

VLSI-SOC – (External Link

) IFIP WG10.5

IEEE Symposia on VLSI Circuits and TechnologyFurther Information

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