Applicability of the FASTBUS Standard to Distributed Control

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Abstract
The new FASTBUS standard has been designed to provide a framework for distributed processing in both experimental data acquisition and accelerator control. The features of FASTBUS which support distributed control are a priority arbitration scheme which allows intercrate as well as intracrate message flow between processors and slave devices; and a high bandwidth to permit efficient sharing of the data paths by high-speed devices. Sophisticated diagnostic aids permit system-wide error checking and/or correction. Software has been developed for large distributed systems. This consists of a system data base description, and initialization algorithms to allocate address space and establish preferred message routes. A diagnostics package is also being developed, based on an independent Ethernet-like serial link. The paper describes available hardware and software, on-going developments, and current applications.

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