Re: Data transfer for real time analysis
From: Larry Doolittle (ldoolitt_at_recycle.lbl.gov)
Date: 04/26/04
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Date: Mon, 26 Apr 2004 05:13:32 +0000 (UTC)
In article <c6h98p$3jm$1@news.iucc.ac.il>, Pini wrote:
>
> We are planning a data acquisition system with 4-12 sub units. Each sub unit
> produce data of 25MBit/sec. The distance between the boxes and computer is
> about 2 meters.
> I'm willing to transfer and analyze the data in real-time. I'm willing to
> close a control loop in 1-5msec (I. wish 100usec ......).
> What is the recommended serial protocol?
> The sub units will be in-house made the host computer for data analysis and
> storage will be a PC (probably with raid HD).
> What communication HW should I use in my sub units?
> What communication HW should I use in the PC?
You're kidding yourself if you think a _reliable_ control loop can
be closed in 1msec or less using general purpose networks and computers.
A dedicated (OS-free) CPU and hard-wired serial links (like you see
on DSP chips) can do the job. So can an FPGA. But to get an answer
to your question, you need to
1) specify your problem better (I/O, volume, budget, compute horsepower)
2) move it to a better set of groups, that's more hardware-oriented.
comp.arch.embedded might still be OK, but drop windowsce and Linux,
and maybe add comp.arch.fpga.
- Larry
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