Saturday, 12 October 2013

What a Designer can do using VHDL -




What a Designer can do using VHDL -



What a Designer can do using VHDL : (Learn VHDL with Naresh Singh Dobal series).




Now next thing is What you can do with the Help of HDL’s-
So here, I should say that you can design a complete digital system and electronics system using HDL’s, You can design any type of circuits like a complete robot system, a home automation system, security system, life style appliances, Industry automation system, PLC’s etc, even you can design a microprocessor or a micro-controller of your own configuration according to your requirement, you can design a computer on chip etc.
Second most widely used application of HDL’s are in Application domain, Here you can directly configure your design or system on Hardware with the help of PLD’s, There are multiple type and class of PLD’s like PAL (Programmable Array Logic), PLA (Programmable Logical Array). SPLD (Simple Programmable Logical Devices), CPLD (Complex Programmable Logical Devices), PROM (Programmable ROM), FPGA (Field Programmable Gate Array), ASIC ( Application Specific Integrated Circuit). Among these FPGA & ASIC are widely used for configuration. That means with the help of FPGA devices we can directly configure our system on Hardware and can test our design in real time environment. We will discuss more thing about PLD's Later in our series. 


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Contact US -
Naresh Singh Dobal
nsdobal@gmail.com

What is the need of HDL in Designing of Today's Complex Structures -





What is the Need of HDL in Designing of Today's Complex Structures -



What is the need of HDL Languages : (Learn VHDL with Naresh Singh Dobal series).



         This is the most Important Question ever, that Why we need of HDL’s, and what we loose without HDL’s?
          For giving the answer of that question more effectively I am going few decades back,  As we discussed previously in early circuit designing (manual designing) or In late of 70’s the circuit designers designed their system with the help of truth tables, Boolean mathematics, K-maps and other expression solving techniques. But chip density and complexity was increasing continuously  and then thousands of gates in a single chip was common and for designing that system was not the easy task for engineers. So Researchers planned some new techniques for designing and verification and invented a totally different concept called HDL  Based Designing and Verification. And second thing early designer and verification engineers worked on the Printed Circuit Boards or on Bread Boards for test and verify their designs, but that was not the practical approach to verify designs because that takes too much time and also the verification engineers was not sure about the verification. There are multiple reasons behind that like if engineer used 1000 gates in verification that first he have to check the response of all the 1000 gates, because if any one of the gates not works properly then we may get the wrong result. That means each gate must be checked before using in logical verification which was not practically possible. That means testing of large circuits was not possible because the large circuits contain lots of gates and the response of each and every gate could not be checked.
Second thing the time needed for logical designing, In early days or in manual designing a large team was needed for designing and more time was needed. After using of HDL’s designing time was shorted because HDL’s are ready to work on sequential execution of statements and the designers only have to write their requirements in the term of language and then synthesis tools convert that High level language into Structural or RTL level or Gate level Design. Hence using HDL’s Circuit Designing was very easy through computer and then we can also develop these codes on hardware using PLD’s. and save time and money.


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Contact US -
Naresh Singh Dobal
nsdobal@gmail.com

Summary : Brief History about VHDL





Summary : A Brief History about VHDL -



Summary : History about VHDL (Learn VHDL with Naresh Singh Dobal Series).



Summary about History of VHDL –



  • According to the records VHDL was initially initiated by US- DoD (United State – Department of Defense), They have initiated VHDL to design there complex architectures of electronics used in defense. But later this was transferred to IEEE for standardization.
  • In 1985 All the rights of VHDL was transferred to IEEE.
  • After two years in 1987 IEEE launched VHDL standards.
  • In 1994 Revised edition of VHDL Standard was published which was named by VHDL 1076-1993.
  • In 2000 again Revised Edition of standard was launched and named by VHDL 1076-2000.
  • VHDL 1076-2002 was published in year 2002.
  • VHDL 1076-2007 was published in year 2007.
  • Recently in year 2009 VHDL revised edition VHDL 1076-2008 was published.



Kindly share your suggestions, queries, comments or questions to make this series more interactive and informative.

Contact US -
Naresh Singh Dobal
nsdobal@gmail.com

Friday, 11 October 2013

VLSI Major Classification (Front End and Back End Design)






VLSI Major Classification (Front End and Back End Design) -


VLSI Major Classification (Learn VHDL with Naresh Singh Dobal series).


VLSI Industry, - VLSI is mainly divided into two major domains, first one is called VLSI Front End and second is VLSI Back End, As I told you previously that this series is designed according to the practical approaches, labs and works, so I am not going into deep, But you must differentiate these two domain to plan your career in better way, The major different between them are –

VLSI Front end considers all the logical designing and verification part, In simple words we can say all the work up to the Gate level or RTL Level designing and verification  considered as VLSI Front End Designing and Verification, We have multiple ways for logical designing of IC (Integrated Circuits)’s in VLSI Front End, For Example in early days when we have very less chip complexity, designers used Manual Logical Designing and they used concept of number system, Basic Gates Concept, K-maps, Boolean Mathematics, expression handling etc.

As the time passed and according to the Moore's law  chip complexity has been increased by multiple times and at that level logical designing was not manageable using manual designing, So Schematics based Designing was discovered, and we started work on computers and simulators,  and We design our systems using Pick and Place concept. In this concept we have some type of tool bars and all the basic components and elements like basic gates, multiplexer, ALU, flip flops was defined in the tool bars with there properties and user just pick that component from the list and place it into the computer screen and then route all the components with the help of wires. But at this level one thing is common and this is designing methods, Using this concept we only optimized the verification concept and this saved a lot of time and money. Because verification needed more than twice of efforts (in term of time and money) as compare to designing.

But again these things failed as the chip complexity increased, So researchers invented a totally different concept of designing and verification. And that concept was HDL Based Designing and Verification. And that concept was perfectly suited at that time for complex chip design (or high density chips). These things reduces the Designing Time and Cost and mainly the verification time.

But now again HDL based designing is exactly where, as the schematic based designing is as before 15 years, because in now a days hundreds of pages of codes are not uncommon and this is really very difficult to handle and manage designs and verification plans. So now the question is What Will be the next ????????

Second is VLSI Back End, that consider all the designing and verification part after logical designing means Gate level or RTL level designing, That may include Floor Planning, Place & Route, and All the foundry work like fabrication, packaging etc. are also comes in VLSI Back End.


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Contact US -
Naresh Singh Dobal

nsdobal@gmail.com

Think Inside the box (VHDL Design) with me "Naresh Singh Dobal"





Series : Think Inside the box (VHDL Design) with me "Naresh Singh Dobal" -



Think Inside The Box (VHDL Design) "Learn vhdl with Naresh Singh Dobal Series".


Hello friends, After considering few of my last blogs I believe you got the basic idea about our EDA & Semiconductor Industry, and now you know that how the computer chips are manufactured and how they are designed, so now you are aware about the process that how this EDA industry is important for VLSI Industry. Today I am going to tell you that how a designer / engineer works with this EDA industry.  I am going to start this with the basics of HDL & most widely used HDL in defense and other complex electronics design i.e VHDL (Very High Speed Integrated Circuit Hardware Description Language). 

So lets start with this educational series named,  “Think Inside The Box”  with me “Naresh Singh Dobal”.



Brief Introduction to VHDL –


VHDL - A small Description (Learn VHDL with Naresh Singh Dobal Series).


VHDL Stands for VHSIC  Hardware Description Language, here VHSIC have it’s acronym i.e. Very High Speed Integrated Circuit.
So VHDL is    “ Very High Speed Integrated Circuit Hardware Description Language “.
Here Hardware Description represents  the whole description of electronics circuits in the term of flow of data, schematic design or interconnection of components and in the terms of functions or truth table.
Integrated Circuits  represents Digital IC.

Language  means a set of standards, codes and commands.

       I would love to read your comments, ideas, questions, suggestions anything, So kindly feel free to contact us at nsdobal@gmail.com or write within the comment bar below to make this series interactive and more informative.

 
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