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Background
MOST is short for Media Oriented Systems Transport. MOST25 was first introduced in the SAAB 9-3 model in 2002 and is now used by numerous european car manufacturers, even though some of them will upgrade to MOST150 in the near future.
MOST25 has an optical physical layer using 50 Mbps NRZI coding. The protocol is using MOST-frames at a rate of 44.1 or 48 kHz, where each frame is consisting of 64 bytes. The frames are partitioned in subframes which are part of synchronous, asynchronous and control messages. Synchronous data can be sound or video, while asynchronous data can be for instance transferring a phone book or updating a navigators map. Control messages are short messages for tasks like "eject CD" or "increase sound volume".
MCBuster
While there are instruments for prototyping and integration available in the market, we found while doing consulting regarding infotainment for a car manufacturer in 2006, that there were no such instrument dedicated for test fleets of pre-production cars.
TOFO Engineering has developed the hardware for the MCBuster which is a sniffer, working as a spy on the MOST25 bus. MCbuster is designed without compromises regarding resistance to the harsh temperature and electrical surroundings that can be present in a car.
There is also a sleeping mode available to make it possible to be continuosly connected to the car. The wake up time of MCBuster is way shorter than the MOST-bus wake up time, which is made possible by the almost instant wake up of the onboard non-volatile FPGA.
MCBuster has been sold to and is used on daily basis by european as well as chinese vehicle manufacturers. Please visit www.fyi.se for more information (and ordering) of MCBusters. For chinese market please visit our distributor www.triv.cn
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