VLSI Training Institutes in Bangalore : VLSI Training Institutes - cranes varsity

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LSI is one of the best options for electronics engineers who are looking for a core job. VLSI offers diverse job profiles with excellent career growth and pays packages in India and abroad...

As this is a highly specialized domain, it’s quite challenging for new college grads(especially for the ones from normal engineering colleges with no placement record in core areas). This is the reason many aspiring VLSI engineers either opt for a Master’s degree in VLSI or any PG Diploma Course in VLSI so as to be VLSI industry ready

Cranes varsity is the best VLSI Training Institutes in Bangalore. Cranes Varsity is a pioneer in Technical Training & Education Services in EMBEDDED, VLSI & DSP with over 22 years of acclaimed expertise. Having built a reputation as leading training providers, we now extend our training domains to emerging industry trends like Automotive, IoT & Data Science.

INTRODUCTION TO VLSI :

Very-large-scale integration (VLSI) is the process of creating an integrated circuit (IC) by combining thousands of transistors into a single chip. VLSI began in the 1970s when complex semiconductor and communication technologies were being developed. The microprocessor is a VLSI device.

Before the introduction of VLSI technology, most ICs had a limited set of functions they could perform. An electronic circuit might consist of a CPU, ROM, RAM, and other glue logic. VLSI lets IC designers add all of these into one chip.

The electronics industry has achieved phenomenal growth over the last few decades, mainly due to the rapid advances in large-scale integration technologies and system design applications. With the advent of very-large-scale integration (VLSI) designs, the number of applications of integrated circuits (ICs) in high-performance computing, controls, telecommunications, image and video processing, and consumer electronics has been rising at a very fast pace

The current cutting-edge technologies such as high resolution and low bit-rate video and cellular communications provide the end-users a marvelous amount of applications, processing power, and portability. This trend is expected to grow rapidly, with very important implications on VLSI design and systems design.

Design Flow of an IC :

The very first step is Specifications which describes abstractly the functionality, interface, and over all architecture of the digital circuit to be designed. At this point, the architects do not need to think about how they will implement this circuit.

The next step we have is a behavioral description which is created to analyze the design in terms of functionality, performance, and other high-level issues.

The behavioral description is manually converted to an RTL description in an HDL. The designer has to describe the data flow that will implement the desired digital circuit.

Once the behavioral description is converted to RTL description, a logic synthesis process takes place which converts the RTL description to a gate-level netlist. A gate-level netlist is a description of the circuit in terms of gates and connections between them.

Logic synthesis tools ensure that the gate-level netlist meets timing, area, and power specifications. The gate-level netlist is input to an Automatic Place and Route tool, which creates a layout. The layout is verified and then fabricated on a chip.

HDL stands for hardware description language that describes the functionality of any hardware of digital; system in the form of text.

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Evolution of HDL :

For a long time, programming languages such as FORTRAN, Pascal, and C were being used to describe computer programs that were sequential in nature. Similarly, in the digital design field, designers felt the need for a standard language to describe digital circuits. Thus, Hardware Description Languages (HDLs) came into existence. HDLs allowed the designers to model the concurrency of processes found in hardware elements.

Therefore Engineers started to use HDL for system-level design. HDLs were used for simulation of system boards, interconnect buses, FPGAs (Field Programmable Gate Arrays), and PALs (Programmable Array Logic). A common approach is to design each IC chip, using an HDL, and then verify system functionality via simulation.

HDLs have many advantages compared to traditional schematic-based design.

•Designs can be described at a very abstract level by use of HDLs, Designers can write their RTL description without choosing a specific fabrication technology. Hence Logic synthesis tools can automatically convert the design to any fabrication technology. If a new technology emerges, designers do not need to redesign their circuit. They simply input the RTL description to the logic synthesis tool and create a new gate-level netlist, using the new fabrication technology. The logic synthesis tool will optimize the circuit in area and timing for the new technology.

•By describing designs in HDLs, functional verification of the design can be done early in the design cycle. Since designers work at the RTL level, they can optimize and modify the RTL description until it meets the desired functionality. Most design bugs are eliminated at this point. This cuts down design cycle time significantly because the probability of hitting a functional bug at a later time in the gate-level netlist or physical layout is minimized.

•Designing with HDLs is analogous to computer programming. I.e A textual description with comments is an easier way to develop and debug circuits.

One can design any hardware at any level

There are two hardware description languages

• VHDL

• Verilog HDL

A Verilog program for a particular application consists of two main blocks

1. Design Block

2. Simulation block

There are two different ways to design the design block

1. Top-down design methodology

2. Bottom-up design methodology.

In a top-down design methodology, we define the top-level block and identify the sub-blocks necessary to build the top-level block. We further subdivide the sub-blocks until we come to leaf cells, which are the cells that cannot further be divided.

In a bottom-up design methodology, we first identify the building blocks that are available to us. We build bigger cells, using these building blocks. These cells are then used for higher-level blocks until we build the top-level block in the design.