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Digital simulation techniques improve μP-system design
Hardware Brock, G 'Logic analyzers conquer LSI complexity' Computer Design Vol 20 No 1 (January 1981) pp 125-129 Providing instrumentation suitable for debugging and troubleshooting systems based on LSI circuits, such as a microprocessor, has been a major challenge to the test and measurement industry. This paper describes the use of logic analysers which overcome the complexities of LSI circuits by using time and data domain recording to isolate microprocessor problems in hardware and software control. The popular architectures are looked at, as well as troubleshooting in both the time and data domains. Georgiou, V J 'Microprocessor controlled digital pulse width modulators' Computer Design Vol 20 No 1 (January 1981) pp 138-144 A pulse width modulator changes the on/off ratio of a pulse train according to a control signal. This article shows practical extensible circuits that illustrate the advantages of digital pulse width modulation in effective low cost microprocessor-based applications ranging from signal processing to serve control. The article also presents two completely different approaches to digital pulse width modulation.
Peacock, G 'Design of portable data-logging systems' Electronics & Power Vol 27 No 2 (February 1981) pp 155-157 Data-logging systems range from comparatively simple instruments capable of handling only a few channels of input, to sophisticated computer controlled systems capable of collecting data at high speed from a large number of points. Nevertheless, all practical logging systems conform broadly to the same design, and the same stringent reliability requirements must be fulfilled, what-
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ever the size. The portable data-logging system must incorporate these design and reliability criteria as well as ease of operation and connection to the transducer (these systems are having ever wider applications and are used by people from a variety of disciplines). This paper describes the special requirements and design constraints for portable data-logging systems.
Software Bennets, R G 'The philosophy of testing digital systems - a pragmatic approach' Electronics & Power Vol 27 No 2 (February 1981) pp 162-165 The prime objective of any test strategy for a digital system is to detect the presence of failure mechanisms that can cause the system to deviate from its correct behaviour. However, knowing where the problems are and where to concentrate resources is part of the key to controlling the costs of testing. This article summarizes the factors that can influence a test strategy and describes a modern seven-stage approach to digital testing. (This approach should reveal not only whether the system is faulty, but also a detailed diagnosis to assist an effective repair.)
Cushman, R H 'Digital simulation techniques improve #P-system design' EDN Vol 26 No 1 (7 January 1981) pp 142-149 With the aid of analogue simulation performed digitally on a microprocessor-based development system, it is possible to handle the increased complexities of present day microprocessor system design. Simulation techniques are especially necessary in the design of a 'big system' with its complex control configurations and algorithms. This article shows how to develop a simulation of a real-world design that can run on a microprocessor development system and is handy for design analysis. The experiences of transferring an analogue computer simulation to a small micro-
processor-based digital computer are also shown.
Jackson, P and Newstead, S O '1nterfacing microprocessor systems' Wireless World Vol 87 No 1541 (February 1981 ) pp 67-69 There are several microprocessor systems, either in kit form or assembled, which can be adapted for process control. In the light of the fact that microprocessor training often does not include microprocessor interfacing experience, this article outlines the design principles required for interface circuits and describes the simple boiler simulator suitable for microprocessor control.
Applications Electronics & Power Vol 27 No 1 (January 1981 ) The whole issue is devoted to 'Microtechnology and Industrial Opportunity'. It contains over a dozen articles on a wide selection of microprocessors and microprocessor applications. Typical are the UK Dol's role in microelectronic development; the application of new technology to traditional industry; the automation and control of the BL Metro production; and the role of microprocessors in health, conservation and construction. An analysis of the effects of the new technology on our educational system is also made.
Noble, A 'Microprocessors in process control systems' Processing Vol 25 No 11 pp 71-72 This paper outlines the developments made in the redesign of equipment to incorporate microprocessors in many fields of engineering practice.
Rapley, D E 'How to select distributed control and data systems' InTech Vol 27 No 9 (September 1980) pp 67-70 It is sometimes necessary, due to
microprocessors and microsystems
Peacock, G 'Design of portable data-logging systems' Electronics & Power Vol 27 No 2 (February 1981) pp 155-157 Data-logging systems range from comparatively simple instruments capable of handling only a few channels of input, to sophisticated computer controlled systems capable of collecting data at high speed from a large number of points. Nevertheless, all practical logging systems conform broadly to the same design, and the same stringent reliability requirements must be fulfilled, what-
158
ever the size. The portable data-logging system must incorporate these design and reliability criteria as well as ease of operation and connection to the transducer (these systems are having ever wider applications and are used by people from a variety of disciplines). This paper describes the special requirements and design constraints for portable data-logging systems.
Software Bennets, R G 'The philosophy of testing digital systems - a pragmatic approach' Electronics & Power Vol 27 No 2 (February 1981) pp 162-165 The prime objective of any test strategy for a digital system is to detect the presence of failure mechanisms that can cause the system to deviate from its correct behaviour. However, knowing where the problems are and where to concentrate resources is part of the key to controlling the costs of testing. This article summarizes the factors that can influence a test strategy and describes a modern seven-stage approach to digital testing. (This approach should reveal not only whether the system is faulty, but also a detailed diagnosis to assist an effective repair.)
Cushman, R H 'Digital simulation techniques improve #P-system design' EDN Vol 26 No 1 (7 January 1981) pp 142-149 With the aid of analogue simulation performed digitally on a microprocessor-based development system, it is possible to handle the increased complexities of present day microprocessor system design. Simulation techniques are especially necessary in the design of a 'big system' with its complex control configurations and algorithms. This article shows how to develop a simulation of a real-world design that can run on a microprocessor development system and is handy for design analysis. The experiences of transferring an analogue computer simulation to a small micro-
processor-based digital computer are also shown.
Jackson, P and Newstead, S O '1nterfacing microprocessor systems' Wireless World Vol 87 No 1541 (February 1981 ) pp 67-69 There are several microprocessor systems, either in kit form or assembled, which can be adapted for process control. In the light of the fact that microprocessor training often does not include microprocessor interfacing experience, this article outlines the design principles required for interface circuits and describes the simple boiler simulator suitable for microprocessor control.
Applications Electronics & Power Vol 27 No 1 (January 1981 ) The whole issue is devoted to 'Microtechnology and Industrial Opportunity'. It contains over a dozen articles on a wide selection of microprocessors and microprocessor applications. Typical are the UK Dol's role in microelectronic development; the application of new technology to traditional industry; the automation and control of the BL Metro production; and the role of microprocessors in health, conservation and construction. An analysis of the effects of the new technology on our educational system is also made.
Noble, A 'Microprocessors in process control systems' Processing Vol 25 No 11 pp 71-72 This paper outlines the developments made in the redesign of equipment to incorporate microprocessors in many fields of engineering practice.
Rapley, D E 'How to select distributed control and data systems' InTech Vol 27 No 9 (September 1980) pp 67-70 It is sometimes necessary, due to
microprocessors and microsystems