Engineering: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.
References
- ↑ Eclipse 500 Avionics Architecture diagram in "Eclipse 500 Avionics". Smartcockpit.com. December 20, 2007. http://www.smartcockpit.com/download.php?path=docs/&file=EA500-Avionics.pdf. Retrieved 2016-02-10.
- ↑ Cena, G.; Valenzano, A. (2004). "Performance analysis of Byteflight networks". 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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