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High speed communication to PC!!

Discussion in 'Electronic Basics' started by Praveen Deshpande, Mar 1, 2004.

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  1. Hi all,

    I am working for one of the application,where the input data rate to
    the unit is 1.6Mbps.It is required to read this data and display it in
    the normal pc.
    I am confused how shall I cope up with this high data rate .
    I thought of using parallel port but I don't think that practically it
    would give this much data rate.I don't have USB and PCI options.
    Actually Unit has to sample the [email protected] in a FPGA(The datain is
    output of an [email protected]) decode it and feed it to the pc and display
    I need to have some high spped means for communication between pc and
    my FPGA device.
    Once again I don't have PCI or USB option.

    Can anybody please suggest me something

    Thanks and best regards

    praveen deshpande
  2. Ian Stirling

    Ian Stirling Guest

    Why don't you have USB options?
  3. Bob Masta

    Bob Masta Guest

    If the data is just for display purposes (and you don't
    need to record a continuous record to a file), then you
    might not need a high *average* rate. Digital scope
    add-ons for PCs use high rates to acquire data, then
    feed it to the PC at slower rates (over the printer port
    or even the serial port). Consider a scope trace that
    is maybe 512 samples wide: If you can update that
    10 times per second, that's already faster than eyes
    can follow as far as detecting waveform changes, etc.

    Of course, if you are talking about image data, then
    you need to redraw the image at rates higher than
    the flicker fusion frequency to get smooth apparent
    motions on-screen. Probably not feasible from a
    printer or serial port unless you have some very
    limited images and can transmit only the changes
    between frames.

    Whatever, the secret is to acquire to an outboard
    buffer at the desired speed, and then send to the
    PC at a lower speed.

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
  4. John Jardine

    John Jardine Guest

    [Sorry, OT]
    Being a DOS junky I noticed your site.
    Compliment ... It has by far, the most straightforward description of 'FFT
    data Windowing' I've ever seen. Nice :).
    Most DSP "tutorial" books can seemingly, effortlessly, fill whole chapters
    with windowing maths, yet have scant, or even reluctant regard
    o --qualitatively-- demonstrating or explaining these effects.
  5. Bob Masta

    Bob Masta Guest

    John, thanks for the compliment! When I first encountered
    FFTs many years ago I was hit with the same sort of high-level
    math you mention. It turned into one of those "OK, well I
    won't try to understand this, just use it" kind of things. Then
    years later I had occasion to use various frequency-selective
    measuring instruments; one day the light dawned and I
    could see what the FFT was doing at a "gut level". It was
    really pretty simple, and I was pissed off that the instructors
    had messed up my mind with "Academic Rigor" without
    laying an intuitive, gut-level groundwork first. So I'm just
    trying to make it easier on the next guy to stumble down
    the path. Hope it helped!

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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