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How hard is IEEE1394 (firewire) ?

Discussion in 'Electronic Design' started by Colin Howarth, Mar 29, 2010.

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  1. Hi,

    I'm designing an external computer audio interface (192 kHz, 24 bit,
    stereo using the Cirrus CS5381 ADC) and, I'd like to connect it using
    firewire.

    I'd thought of using an Oxford Semi OXFW... chip, but they got taken
    over by some outfit called PLX last year and all I can find is NAS/DAS
    storage chips (SATA) and PCI(e) bridges...

    What I was looking for was the simplest sort of serial to FW bridge.

    I suppose a TI TSB41AB1 transceiver and TSB12LV01B link layer controller
    (plus serdes used the wrong way round?) would do it, but (as an amateur)
    I'm wondering whether I'll be able to get this going without the IEEE
    standard since the datasheet for the TSB12LV01B does fairly warn

    "This document is not intended to serve as a tutorial on 1394; users are
    referred to the IEEE 1394-1995 serial bus standard for detailed
    information regarding the 1394 high-speed serial bus."


    I guess I'll end up using the FT2232H USB Hi-Speed UART ... :-(


    Thanks,

    colin
     
  2. Ecnerwal

    Ecnerwal Guest

    Given that 1394 is becoming an interface that's not on new computers,
    avoid the agony of designing your product to use it. USB2.0 will get 'er
    done and work on non-vintage computers. I don't consider the loss of it
    a good thing, but the fact is it's not there...
     
  3. But:

    Thanks (both of you). I suppose that backs up the difficulty in finding
    suitable chips.

    The why is partly due to what I'd read about FW and USB. And because I'd
    like to get around to doing my own (DSO) oscilloscope interface (i.e.
    like the electric guitar interface, but running at 12bit / 500 Msps :)

    Maybe I'll get the book, and then do it with USB anyway...
     
  4. JW

    JW Guest

    That's pretty high sample rate for a 12 bit A/D converter - those should
    cost a few bucks. I just repaired a rather unusual scope that had 12 bit
    A/D converters - a Nicolet Integra 20. It had 4 channels of differential
    input. However it's sample rate was 1MS/s and it's bandwidth was rated at
    500KHz.
     
  5. True enough. Looks like around 180 USD. I actually just picked the
    number out of the air, rather than going for the 12bit 1 GSPS chip from
    TI -- that one costs around 800 USD :cool: Sensibly I might consider going
    down to 250 MSPS :) Even more sensibly, I want to do the audio
    interface first.
    Specially designed for those hard to catch slow events? :) Or for high
    accuracy,more likely.
     

  6. Ah, the marketplace always knows best...

    So, the chips cost a dollar or two more and the USB guys can write the
    number 480 (instead of 400) on the box.

    That USB loads the processor more and has "substantially" lower
    throughput is irrelevant.

    *sigh*

    I've ordered the book by the way.
     
  7. JosephKK

    JosephKK Guest

    And i think i may join them. USB 3.0 is out now and the connectors are
    different and a lot of other things. See also eSATA. Must also mention
    PCI-E(xpress) 3.0. Move over InfiniBand, there are new pigs at the trough.
     
  8. John Nagle

    John Nagle Guest

    FireWire is more or less obsolete at this point.

    I once wrote a FireWire camera driver for QNX, to support
    stereo cameras. But that was 7 years ago.

    FireWire is really a local area network, not a "bus".
    Linux supports IP over FireWire, and Windows XP did, but
    but Microsoft took that capability out of Vista.

    John Nagle
     
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