Standard

SAE AIR5654A

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Merknad: Denne standarden har en ny utgave: SAE AIR5654A

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Omfang

This Handbook is intended to accompany or incorporate AS5643, AS5643/1, AS5657, AS5706, and ARD5708. In addition, full understanding of this Handbook also requires knowledge of IEEE-1394-1995, IEEE-1394a, and IEEE-1394b standards. This Handbook contains detailed explanations and architecture analysis on AS5643, bus timing and scheduling considerations, system redundancy design considerations, suggestions on AS5643-based system configurations, cable selection guidance, and lessons learned on failure modes. Purpose The purpose of this document is to provide application details, including explanations of AS5643, AS5643-based system design considerations, bus timing and scheduling, experiences on design tools, and lessons learned, that are not typically included in a SAE standard such as AS5643. It is intended to promote and support the use of AS5643, and to serve as a platform for information exchange. Background IEEE-1394 was invented by Apple Computer in the 1980s and is also known as Firewire. In 1995, the IEEE adopted it and created a specification to support its use. That specification has been continuously upgraded and improved. In 2002, the IEEE released 1394b, the version SAE has adopted for use in military and aerospace vehicles. IEEE-1394-2008, which combines all of the previous versions and errata into a single document, was released June, 2008. Answers to Q1 and Q3 in Section 11 will provide more details on different versions of IEEE-1394 standards. Prior to its use in the Lockheed Martin F35 Lightning II (Joint Strike Fighter), IEEE-1394b had never been used as a flight critical or mission critical system data bus in any military or aerospace vehicle. The IEEE-1394b specification does not provide necessary functionalities, such as guaranteed determinism and information integrity for use in aerospace applications, such as the flight control system for aircraft. For that reason, the SAE variant of IEEE-1394b was conceived and implemented. In addition to the F-35 program, the use of IEEE-1394b for safety critical/mission critical systems has been considered or is being considered by other major commercial aircraft program, space manned and unmanned vehicles for explorations, and defense systems other than fighters.

Dokumentinformasjon

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