"Logic Circuits Simulation In Training Systems"
Author: Dmitriy Zanyala
Autosynopsis
1. Prologue
1.1 Introduction (Urgency And Motivation)
1.3 Prospective Scientific Novelty And Planned Practical Value
2. Basic Part
2.1 Local Review
2.2 National Review
2.3 Global Review
3. Final Part
3.1 Description of the Received and Planned Results on a Subject
3.2 Conclusions
3.3 Literature
The choice of the given subject has been caused by the offer of my supervisor of studies. He has suggested to be engaged in development of training system. However this job has been intended for several students, and fields of activity should be shared. As the training system provided job with rates «architecture of the COMPUTER» and other rates connected with digital electronics there was actual a question on a subsystem of modeling of logic circuits which could:
- evidently to show training a principle of job of the given logic element;
- to allow the trainee to experiment himself with the given element, to track all those features of job which the modeling system allows to see;
- to check up knowledge of the trainee by answers to the various test tasks constructed on the basis of the modeling subsystem.
I have chosen this part of job.
The urgency of a problem can be considered doubly.
On the one hand it is an urgency of training systems, with another it is an urgency of modeling questions.
The first proves to be true the following factors:
- all greater distribution of remote training and demand for it;
- the unconditional leading part of information technologies during distribution of remote training.
The urgency of the second also is confirmed with strong introduction in process of development and manufacture of electronic devices of hardware-software products - CAD, one of which parts is just the system of modeling.
Criteria to which there should correspond developed subsystem have above been described. The following tasks subject to the decision for successful development of a subsystem follow from these criteria:
- as one of criteria of a subsystem is successful demonstration to the pupil of all subtleties of investigated logic elements it is necessary to achieve the greatest realness of model’s job;
- it is necessary to provide standard opportunities of the modeling application, as that: the graphic interface, visualization of process of job of elements and so forth;
- it is necessary to provide specific opportunities, characteristic for training system, namely: an opportunity to create with the help of a subsystem test tasks, and as an opportunity to respond on them, using the graphic interface.
Practical value of such product as the developed subsystem consists in an opportunity of its use in educational process for formation at trainees of deeper understanding of principles of job of the logic elements being a basis of today's digital techniques. Modeling of element’s job in view of all time and level features will allow the future experts to find more thin understanding of the processes occurring in digital devices.
Modern modeling systems are focused in the greater degree not on accuracy of modeling, and for the size of the modeled circuit. That it is possible to understand, in fact the sizes and complexity of used circuits every year increase. However, creating modeling subsystem not with practical, and with the educational purpose, it is quite possible for it to allow realizing the big accuracy of modeling, somewhere, probably, having conceded in speeds or in volumes of the circuit. Scientific novelty of a developed product also consists in this bias aside accuracy.
In problems of digital modeling of logic circuits and remote training many now are engaged. PhD J. E. Zinchenko [9] and some masters [10, 11] are close to this problem are close in DonNTU. More the underground group interested me магистерских jobs can be seen in the list of links in section «Pages of masters».
In general it is possible to say, that in DonNTU the subject of application of IT-technologies is rather widely investigated during remote training since very much many masters write on them jobs. The subject of modeling of logic elements is in the pure state less popular, more it consider under a corner or testing of already simulated devices, or modeling as the assistant in designing. And in such performance this subject is one of priority directions of development of scientific idea of faculty of CS DonNtU.
I shall allow itself to relate to the national review of development not only the Ukrainian firms, universities and establishments, but also Russian in view of affinity of the countries and directions of development.
So, among examples of use and development of training products and systems it is possible to result:
- Remote qualifying rates of firm 1С [6] (Russia);
- system of innovative education in the Moscow State University [7] (Russia);
- educational programs of firm 1С series "1С:Репетитор" [1] (Russia);
- industrial training systems of firm NPG "Planet" [2] (Russia).
Among the developed modeling systems such:
- ControlPanel - the system placed in the Internet containing dynamic models of logic elements [12] (Russia);
- system of functional - logic modeling the digital equipment LAD 3.1, developed on faculty " Computer systems and networks " MEPI (Russia) [13].
Also in related topics are engaged at the Kharkov state technical university of radio electronics [8], in Institute of the applied system analysis from NTUU "KPI" (Kiev) [14] and in many other technical colleges of Ukraine.
Remote training has obtained in the world also a significant recognition and development. We shall take even for a long time all known school ECES [5] though she and is not an example of electronic remote education. The main office of this school is in Holland, and she works worldwide.
At a global level in the world the set more or less complex CAD for designing digital devices is developed, each of which comprises modeling part. They are Micro Cap, PCAD, OrCAD, EWB, Active-HDL, Verilog and so forth.
However especially it would be desirable to stop on CAD with open initial code Electric VLSI Design System. On a site [18] it is possible to receive performance about opportunities of this system, and also to download its code in languages C++ or Java. The given fact is rather interesting from the point of view of use of the given system as base to the further improvement.
Except for it we shall result some educational institutions and the organizations engaged in development in sphere of digital modeling in the world:
- Modeling and Simulation Information Analysis Center (MSIAC) – Analytical information centre on modeling (America).
- Centre for Modeling and Simulation University of Pune [16]- The center of Modeling has been organized in August 2003 to develop, support and facilitate the academic and research activity connected to modeling. The center carries out significant researches, including highly effective calculation and operations with the large-scale numerical data. The center focus the efforts in two basic areas: modeling of complex systems and modeling of materials. Among modeling complex systems modeling of large logic circuits is considered also.
- Strathclyde University, Glasgow, Scotland. The CAD Centre – the research division of university, is a part of branch Design Manufacture and Engineering Management. Is engaged in researches on the field of digital modeling [17].
- Group VLSI/CAD at University of Colorado, focus efforts first of all to development of the automated designing, its tools and algorithms. Spent research is focused to three areas: formal check of digital systems, synthesis of low power circuits, and development of packages of binary diagrams of decision-making (BDD) [20].
- Fujitsu, Labs. CAD – the Japanese laboratory engaged in problems in the field of digital modeling [19].
As a result of the carried out research in the field of remote training and systems of modeling of logic circuits the following results have been received:
- the conclusion, that by the most perspective direction in development of applications including concerning remote training, the direction of the Internet - application is is made;
- available systems of modeling (MicroCap, OrCAD, EWB, ActiveHDL) are analyzed and some features of models requiring for improvement from the point of view of accuracy of reflection of features of job of logic elements are revealed;
- development of the visual shell of a subsystem moves ahead. One of possible variants of realization of process of modeling is shown in figure below (number of picture- 7, number repeatings - 10, size - 8KB).
The task in view is carried out by detailed elaboration of model of logic elements, with application of the newest technologies of construction of the application and the visual interface of training.