The method combining thousands of transistors into a single chip is called VLSI. VLSI stands for 'Very Large scale integration' and began in the 1970s. In that time complex semiconductors and communication technologies were in the early stages of development. The microprocessor is a VLSI device. Before VLSI, IC's were limited in the performance of their functions. An electronic circuit may contain a CPU, ROM, RAM, etc and VLSI enabled IC designers to add all of these into one chip. The growth of the electronic industry has been massive due to rapid growth in large scale integration technologies and system design applications. With VLSI, the number of applications of integrated circuits in high-performance computing, controls, telecommunications, image and video processing, and consumer electronics has grown at a tremendous pace. Current technology phenomenons such as high resolution, low bit rate video, and cellular communications provide users with portability, applications, processing power, etc. The trend is growing rapidly with very important implications on VLSI design and systems design.
VLSI Design Flow
The various levels of design are numbered and show processes in the design flow. Specifications come first, they describe abstractly, the functionality, interface, and the architecture of the digital IC circuit to be designed.
Design Specifications
Schematic Capture
Create a Symbol
Simulation
Layout
Design Rule Check
Extraction
Layout vs Schematic Check
Post Layout Sim
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