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Micronas MAS3507D MP3 decoder IC on ISA?

Discussion in 'Electronic Basics' started by Kris Jones, Nov 10, 2003.

  1. Kris Jones

    Kris Jones Guest

    I was looking at the spec sheet for the Micronas MAS3507D MP3 decoder,
    http://www.micronas.com/products/documentation/consumer/mas3507d/index.php
    and I noticed that you can also use 8-bit parallel input.

    I was thinking about making a hardware MP3 player for PC/104
    interface, which is actually ISA.

    Could you just attach the MP3 decoder to an ISA bus and stream MPEG
    data to it in parallel?

    Am I crazy or would that work?

    It seems to me the biggest problem would be getting the timing to
    match up.
     


  2. I don't know anything about this IC, but based on what you've said above I
    think it should work. You'll need to address-decode the ISA bus (i.e.,
    allocate an ISA address to the MP3 IC) and just stream the music data to
    that address one byte at a time. You could also use a buffer RAM to ensure a
    stable timing.

    rgds,
    Costas
     
  3. Daniel  Simon

    Daniel Simon Guest

    Why not just use the printer port that your PC/104 computer is almost
    certainly already equipped with?
     
  4. Kris Jones

    Kris Jones Guest

    I thought about that kind of solution, and I just think it would be
    messier. First off it would make it a dongle, which I am not too fond
    of. Then there is the difference in speed. Then it would need an
    external power supply.

    I am also very fond of the PC/104 form factor. I have many
    single-board computers that have these slots. Sound cards in PC/104
    are hard to come by, and all I would want them to do is play MP3, so
    why not throw in a hardware decoder? Then you could play them on
    anything, even a 386! (And no, slow cpus aren't rare in embedded
    form-factors, Advantech still sells 386SX PC/104 cpu boards.)

    Also, if I were to start with an LPT solution first, the design would
    be very different. If I ever decided to move to ISA I would have to
    just scrap all the designs for LPT anyway.
     
  5. Kris Jones

    Kris Jones Guest

    Anybody know anything about developing for ISA and want to give me a
    hand?

    I'll probably need someone to write drivers for it also.

    If it turns out to be do-able, maybe it could become a commercial
    product... and of course you would get a percentage!
     
  6. If you provide the chip (PLC44), we can make the board for you.
    The board will probably be less than $5 (qty 100) without the chip.
    I emailed you with my real email ID.
     
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