Re:The Car, Reinvented
by mrwesleycrusher on Sunday July 05, 2020 @10:49AM
(#23739079)
Because Flex Ray is better for real time systems and has been around over 10 years. Don't get me wrong, CAN and LIN have their place but CAN has a lot of jitter, especially in a car when you can kinda guess how often an ECU is going to spit out messages to the other ones. The only thing you lose with FlexRay is now your controllers have to speak flexray, which is a more complex standard.
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I would never voluntarily design Flexray into anything. It's not especially fast, it's conceptually convoluted, the resulting bus is brittle, and there's very few choices for silicon. I spent a flight to Germany reading a book about the bus (I was working on a project that needed to interface with it).
Traditionalists like to point to its latency guarantees, but you can do just as well with a thoughtful Ethernet implementation. And there are single pair PHYs. Others argue in favor of the multidrop topology, but I see it as a common failure point. Plus it erodes the utility of the bandwidth.
For multiple drops I like CAN a lot better.