# Byteflight

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'''Byteflight''' is an [automotive](/source/automotive) [databus](/source/Bus_(computing)) created by [BMW](/source/BMW) and partners [Motorola](/source/Motorola), [Elmos Semiconductor](/source/Elmos_Semiconductor) and [Infineon](/source/Infineon) to address the need for a modernized safety-critical, fault tolerant means of electronic communication between automotive components. It is a message-oriented protocol. As a predecessor to [FlexRay](/source/FlexRay), byteflight uses a hybrid synchronous/asynchronous [TDMA](/source/Time_division_multiple_access) based means of data transfer to circumvent deficiencies associated with pure event-triggered databuses.

It was first introduced in 2001 on the [BMW 7 Series (E65)](/source/BMW_7_Series_(E65)).

[Eclipse 500](/source/Eclipse_500) jet aeroplanes use Byteflight to connect the avionics displays.<ref>Eclipse 500 Avionics Architecture diagram in {{cite web| url=http://www.smartcockpit.com/download.php?path=docs/&file=EA500-Avionics.pdf| title=Eclipse 500 Avionics| website=Smartcockpit.com| date=December 20, 2007| access-date=2016-02-10| archive-url=https://web.archive.org/web/20160215182621/http://www.smartcockpit.com/download.php?path=docs%2F&file=EA500-Avionics.pdf| archive-date=February 15, 2016| url-status=dead}}</ref>

==Data frame==
In Byteflight terminology, a data frame is called a "telegraph".

A telegraph starts with a start sequence containing six dominant bits. This start sequence is followed by a one byte message identifier. This is followed by a length field indicating the length in bytes of the transmitted data. The telegraph ends with a 15 bit CRC value encoded in two bytes leaving the LSB unused.<ref name=perfm>{{cite conference| last1=Cena| first1=G.| last2=Valenzano| first2=A.| title=Performance analysis of Byteflight networks| conference= IEEE International Workshop on Factory Communication Systems, September 22nd - 24th, 2004, Vienna University of Technology, Vienna, Austria| year=2004| book-title=Proceedings| publisher=[IEEE](/source/IEEE)| location=Piscataway, NJ| isbn=0-7803-8734-1| pages=157–166| doi=10.1109/WFCS.2004.1377701}}</ref>

All bytes are framed by a recessive start bit at the beginning and a dominant stop bit at the end.

==References==
{{reflist}}

==External links==
* [https://web.archive.org/web/20061113203037/http://www.byteflight.com/whitepaper/index.html byteflight.com] (archived)

Category:Auto parts
Category:Computer buses

{{automotive-part-stub}}

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Adapted from the Wikipedia article [Byteflight](https://en.wikipedia.org/wiki/Byteflight) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Byteflight?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.