Byteflight

Byteflight is an automotive databus created by BMW and partners Motorola, Elmos Semiconductor and 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, byteflight uses a hybrid synchronous/asynchronous TDMA 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).

Eclipse 500 jet aeroplanes use Byteflight to connect the avionics displays.[1]

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.[2]

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

gollark: You have to have it do *an* extra network round trip in order to not have to statically include the stuff in the page and run into the issue the whole external navbar thing is meant to solve.
gollark: It is then harder to change.
gollark: With server rendering: client gets HTML page from server, draws it.With client rendering: client gets HTML page, partly draws it, notices JS in it, fetches JS, executes it, draws result.
gollark: There is an ADDITIONAL NETWORK ROUND TRIP!
gollark: WRONG!

References
  1. Eclipse 500 Avionics Architecture diagram in "Eclipse 500 Avionics" (PDF). Smartcockpit.com. December 20, 2007. Archived from the original (PDF) on February 15, 2016. Retrieved 2016-02-10.
  2. Cena, G.; Valenzano, A. (2004). "Performance analysis of Byteflight networks". Proceedings. WFCS 2004 - 2004 IEEE International Workshop on Factory Communication Systems, September 22nd - 24th, 2004, Vienna University of Technology, Vienna, Austria. Piscataway, NJ: IEEE. pp. 157–166. doi:10.1109/WFCS.2004.1377701. ISBN 0-7803-8734-1.


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