VLSI - Very Large Scale Integration
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A VLSI Device Commonly Known, Is The Microcontroller. Before VLSI, Most ICs Had Limited Functions. An Electronic Circuit Usually Consists Of A CPU, ROM, RAM And Other Peripherals On One Board. VLSI Lets IC Designers Add All Of These Into One Chip. Let’s Look Into The Backstory Of VLSI Development Before Going Into Specifics.
Designing A VLSI IC
The Design Of A VLSI IC Consists Broadly Of 2 Parts. Front End Design Includes Digital Design Using HDLs Such As Verilog, VHDL, SystemVerilog And The Like. It Includes Design Verification Through Simulation And Other Verification Techniques. The Process Includes Designing, Starting From Gates To Design For Testability. Backend Design Comprises Of CMOS Library Design And Its Characterization. It Also Covers Physical Design And Fault Simulation. The Entire Design Procedure Follows A Step By Step Approach. The Front End Design Steps Would Involve,
Problem Specification
It Is A High-Level Representation Of The System. The Major Parameters Are Performance, Functionality, Physical Dimensions, Fabrication Technology And Design Techniques. It Has To Be A Tradeoff Between Market Requirements, The Available Technology And The Economic Viability Of The Design. The End Specifications Include The Size, Speed, Power And Functionality Of The VLSI System.
Architecture Definition
Basic Specifications Like Floating Point Units, Which System To Use, Like Reduced Instruction Set Computer (RISC) Or Complex Instruction Set Computer (CISC), Number Of ALU’s Cache Size Etc.
Functional Design
Defines The Major Functional Units Of The System And Hence Facilitates The Identification Of Interconnect Requirements Between Units, The Physical And Electrical Specifications Of Each Unit.
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