摘要:

Modular design is one of the key factors in building new-generation computer systems. Three principal classes of system construction models are data flow, control flow and the combination of data flow and control flow. Based on the project AIDS, the paper presents an extended control-flow-data-flow model applying to both software and hardware system development, and then describes the system design language SDL. This is a very high-level language, which provides a natural way for users to design systems exploiting concurrency for the combined model. The language, implemented in Prolog, is considered to be precise, flexible, readable and easy to use. A case study is given for comparison with the previous language G

ISSN:1744-683X    

DOI:10.1049/sm.1983.0053

出版商:IEE    

年代:1983

数据来源: IET

摘要:

A method for fault handling is presented, designed for multiprocessor systems supporting concurrent processes co-operating through message exchange. The proposal is described in reference to a specific system, i.e. the MuTEAM prototype developed in Pisa. The requirement was that no erroneous output should be generated by the system under a single-fault hypothesis. The fault-handling model adopted is based on backward error recovery. The set of all the application processes is partitioned into disjoint subsets (called families), which represent the atomic unit of recovery. Recovery points are established on communications among families. A single consistent recovery line is maintained, thereby avoiding the domino effect. The model does not rely on the use of mass storage devices; rather, the recovery information pertinent to all the processes is kept in the distributed main memory of the system.

ISSN:1744-683X    

DOI:10.1049/sm.1983.0054

出版商:IEE    

年代:1983

数据来源: IET

摘要:

Very large scale integration (VLSI) represents not only the threshold of a capability for combiningover 100 000 electronic components on a die of silicon, but also yet another stage in the growth of a volatile industry. The incredible feat of harnessing a wide range of technologies to achieve this degree of integration, and even hold out the prospect for evolution to 106elements and beyond, often tends to obscure the fact that this is also being implemented in high manufacturing volumes and at ever decreasing costs. As a result, it is expected that the characteristic rapid growth of integrated-circuit production will continue over the next decade. However, the scale of the industry has now reached a point where fundamental changes are likely and the pressures resulting from the manufacturing commitments and the market reactions will come to dominate the purely technical influences. VLSI, especially via the leverage of electronic systems, now represents a major influence on world economies, and the commitment necessary to cost-effectively produce such devices in volume stretches the resources of even the largest companies. The objective of the paper is to outline, against the background of the evolution of the integrated circuit industry, the wide consequences of VLSI technology, which, by the contribution it makes and the magnitude of the resources needed to even participate, raises issues at national ana strategic levels which are likely to be determining factors in the future direction of the industry.

ISSN:1744-683X    

DOI:10.1049/sm.1983.0055

出版商:IEE    

年代:1983

数据来源: IET