Design a home and industry based security systems using VHDL.. Could be used for sensoring temperature changes,motion detector,water-level sensor,fire sensor,back and front door detection etc....
VHDL has been at the heart of electronic design productivity since initial ratification by the IEEE in 1987.For almost 15 years the electronic design automation industry has expanded the use of VHDL from initial concept of design documentation to design implementation and functional verification. It can be said that VHDL fueled modern synthesis technology and enabled the development of ASIC semiconductor companies.
The use of vhdl has evolved and its importance increased as semiconductor devices dimensions have shrunk. Not more than 10 years ago it was common to mix designs described with schematics in favor of the hardware description language only.
The fact that VHDL is adaptable is a tribute to its architecture. The industry has seen the use of VHDL’s package structure to allow designers, electronic design automation companies and the semiconductor industry to experiment with new language concepts to ensure good tool design and data interoperability. When the associated data types found in the IEEE 1164 standard were ratified, it meant that design data interoperability was possible.
The design community continues to see benefits as the electronic design automation community continues to find new algorithms to work from VHDL design descriptions and related standards to again push designer productivity. And, as a new generation of designers of programmable logic devices move to the use of hardware description languages as the basis of their design methodology, there will be substantial growth in the number of VHDL users.
The VHSIC Hardware Description Language is an industry standard language used to describe hardware from the abstract to the concrete level.VHDL resulted from the work done in the ‘70s and early ‘80s by the U.S Department of Defence.Its roots are in the ADA language, as will be seen by the overall structure of VHDL as well as other VHDL statements .VHDL usage risen rapidly since its inception and is used by literally tens of thousands of enginners around the globe to create sophisticated electronic products.VHDL is a powerful language with numerous language constructs that are capable of describing very complex behavior.
In 1986,VHDL was proposed as an IEEE standard, It went through a number of revisions and changes until it was adopted as the IEEE 1076 standard in December 1987.The IEEE 1076-1987 standard VHDL is the VHDL used in this book.All the examples have been described in IEEE 1076 VHDL,and compiled and simulated with the VHDL simulation environment from Model Technology Inc.The synthesis examples were synthesized with the Exemplar Logic Inc. synthesis tools.
The Ada language is the result of the most extensive and most expensive language design effort ever undertaken. Up until 1974 half of the applications at The Department of Defense were embedded systems. An embedded system is one where the computer hardware is embedded in the device it controls. More than 450 programming languages were used to implement different DoD projects, and none of them were standardized. Because of this, software was rarely reused. For these reasons, the Army, Navy, and Air Force proposed to develop a high-level language for embedded systems.
By 1977, a complete language design specification for Ada was created. In April 1977, four proposing contractors were chosen to produce Phase I of the language design. In February 1977, Phase I of the language design was complete. Following this, was a two month evaluation period where 400 volunteers in 80 teams chose two out of the four as being the best language designs. These two companies were then given the go ahead to produce Phase II of the project. At the end of Phase II, another two month evaluation period took place. In May of 1979 the Cii Honeywell/Bull (the only foreign contractor) language design was chosen as the winner. Phase III of the project began after the winner was selected. After a winner was selected, the language design was published by the ACM. In November 1979, over 500 language reports were received from 15 different countries. Most of the reports suggested minor changes in the design, none real drastic. Based on these suggestions, a revised language design was published in February of 1980. After some minor changes to this document over the next few years, the final official version of the language was settled upon. The Ada language was then frozen for the next five years
Ada is a comb-structured, statically typed imperative computer programming language designed by a team led by Jean Ichbiah of CII Honeywell Bull under contract to the United States Department of Defense during 1977–1983. Ada addresses some of the same tasks as C or C++, but Ada is strongly-typed (even for integer-range), and compilers are validated for reliability in mission-critical applications, such as avionics software. Ada was named after Ada Lovelace, who is often credited with being the first computer programmer.
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