Re: Data transfer for real time analysis

From: Edward Lee epl (me_at_linnix.com)
Date: 04/28/04 

Date: 27 Apr 2004 22:56:35 -0700

"Pini" <pinit@ee.bgu.ac.il> wrote in message news:<c6mjmn$r5j$1@news.iucc.ac.il>...
> The system is developed for academic research of biological signals.
>
> Each channel sampling rate is 25KHz. Each data frame holds 25 samples. The
> data will be processed in frames.

This is a big difference from your original posting, 25MHz (A) vs. 25KHz (B).

Plan A:
FPGA, DSP, Gigabit ethernet, ATM and nanotech.

Plan B:
CPLD, uC, 10T, RS232, USB and microsoft tech.

Which plan are we going with, Professor?

> I' planning to use a PC with 4 CPU's. One fore handling the data
> communication and memory allocation, one for handling the HD storage and the
> 2 last CPU will be for number crunching. A second alternative is to use a
> PCI board with multiple DSP for data analysis and the PC will do the data
> fusion from all the channels for closing the loop (and data storage).
> We can use FPGA at the sub-units if required.
> We can not afford any data package loss.
> Regarding the selection of the communication protocol:
>
> TCP/IP:
> What will be worst the latency of each channel if I use TCP/IP Hub
> (100MBit/sec
> or 1000MBit/sec)?
> Will the use of windows CE guaranty the Ethernet frame overall latency?
> (Did someone tried the real-time TCP/IP extension from:
> http://www.vci.com/products/windows_embedded/rttcpip.asp )
>
> I2C:
> What HW should I use on the PC side?
> What about SMBus? What should I use on the PC side?
>
> USB:
> I can use the USB protocol but I have a latency of 1msec (can I reduce this
> latency)?
> What is the USB Hub latency?
>
>
> Regards
> Pini
>
>
> ‏‏"Pini" <pinit@ee.bgu.ac.il> כתב בהודעה
> news:c6h98p$3jm$1@news.iucc.ac.il...
> > hi,
> >
> > 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?
> >
> > Regards
> > Pini
> >
> >

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