The ARINC 629 civil aircraft avionic databus standard has been applied by Boeing in the development of the new 777 aircraft and is intended to provide general purpose data communications between avionic sub-systems in future civil IMA (Integrated Modular Avionics) architectures. The 629 standard describes two independent medium access level protocols for communications across a common, multiple access databus. These are known as the basic protocol and the combined protocol; the main difference being the manner in which bus arbitration occurs. This paper describes the results of a study carried out at the University of York on behalf of British Aerospace, addressing the timing behaviour of the 629 databus under each of the two protocols. Estimates of worst-case end-to-end (application-to-application) message transmission delays are derived. These are expressed in terms of design-time bus configuration parameters (such as the bus minor-frame duration and the transmission windows assigned to individual terminals) and the potential delays introduced by the run-time executive, e.g. an ARINC 653 (APEX) compliant kernel.
Timing analysis of the ARINC 629 databus for real-time applications
1997
7 Seiten, 5 Quellen
Conference paper
English
`Timing analysis of the ARINC 629 databus for real-time applications'
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