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Software Considerations for Interfacing Avionics Computers and Mux Buses
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English
Abstract
Desirable features for bus terminals that interface MIL-STD-1750 A avionics computers to MIL-STD-1553 B buses are discussed. Software considerations are emphasiszed: terminal features that simplify the attendant computer software for bus I/O, that minimize the burden on processor throughput, and that provide flexibility for handling variable bus traffic schedules.
The most challenging requirements arise in complex, multimode avionics systems with multiple computers interfacing via MUX buses. The computers are usually busy, and both the processing loads and bus interface loads vary among the several modes, so fixed, synchronous processing and bus schedules are not practical. It is often necessary to decouple the processors from one another, and execute the processing and the bus I/O asynchronously. Judicious design of a smart terminal can reduce the I/O interrupts and other burdens on the CPU, freeing it for its primary task of processing.
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Citation
Plehaty, S., "Software Considerations for Interfacing Avionics Computers and Mux Buses," SAE Technical Paper 860853, 1986, https://doi.org/10.4271/860853.Also In
References
- MIL-STD-1750A (USAF) Sixteen-Bit Instruction Set Architecture 1982
- MIL-STD-1553B Aircraft Internal Time-Division Command/Response Multiplex Data Bus 1978
- Multiplex Applications Handbook (MIL-STD-1553) 1982 USAF AFSC (ENASD), WPAFB
- MIL-STD-1553B Bus Control Interface for MIL-STD-1750B 1985
- Moore, E.F. Gedanken Experiments on Sequential Machines 129 153 Automata Studies Shannon C. E. McCarthy J. Princeton University Press 1956