[time-nuts] Timing on Ethernet
bob.paddock at gmail.com
Fri Aug 3 19:59:36 EDT 2007
On Friday 03 August 2007 07:22, Pablo Alvarez Sanchez wrote:
> At CERN we are considering the possibility of using Ethernet as a real
> time field bus.
There are a couple of projects that have already gone down this road,
Related are, but these are more at the operating system level than
the line timing level:
On my assumption that you mean Hard Real Time:
Have you looked at FlexRay and/or TTP? Standard communications to be used
in the 2008 model year in most cars. Several chips support FlexRay today.
Also used in "by-X" controls, like "Fly-by-wire", "break-by-wire" etc.
You can get chips for FlexRay from various players today.
Come to think of it I don't recall ever seeing TTP or FlexRay mentioned
here on the Time-Nuts list? They get into things like:
"The clock drift must be no more than 0.15% from the reference clock,
so the difference between the slowest and the fastest clock in the system is no greater than 0.3%."
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