VLSI FULL FORM
Full Form of VLSI : Very Large Scale Integration
What is the full form of VLSI?
No:1. The full form of VLSI is Very Large Scale Integration.
No:2. By incorporating thousands of transistors into a single chip, VLSI is the process by which integrated circuits (ICs) are produced.
No:3. Before the introduction of VLSI technology, most circuits restricted the range of functions they can handle.
No:4. A ROM, CPU, RAM and other glue logic might comprise an electrical circuit.
No:5. VLSI allows all of that to be added into one chip by IC designers.
No:6. It’s used on a single mini-silicon chip to build so many chips & circuits.
No:7. VLSI started when complicated semiconductor & communication techniques were developed in the 1970s.
No:8. VLSI computer is a microprocessor.
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Structured design
No:1. Structured VLSI design is a modular methodology originated by Carver Mead and Lynn Conway for saving microchip area by minimizing the interconnect fabrics area.
No:2. This is obtained by repetitive arrangement of rectangular macro blocks which can be interconnected using wiring by abutment.
No:3. 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.
No:4. 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.
No:5. 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 Edsger Dijkstra’s structured programming approach by procedure nesting to avoid chaotic spaghetti-structured programs.
Difficulties
As microprocessors become more complex due to technology scaling, microprocessor designers have encountered several challenges which force them to think beyond the design plane, and look ahead to post-silicon:
No:1. Process variation
No:2. Stricter design rules
No:3. Timing/design closure
No:4. First-pass success
No:5. Electromigration
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