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Discussion in 'Electronic Design' started by MichaelE, May 21, 2004.

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  1. MichaelE

    MichaelE Guest

    Can a FIFO IC that is 512 x 8 be used as a 2048x2 by series connecting in to out on 4 channels? It seems there shouldn't be any issues but I'm not sure. I'm considering IDT's 72210 series IC, I haven't seen any ICs with 1 or 2 bit widths and 2048 bits long.

  2. Tim Wescott

    Tim Wescott Guest

    Check the setup and hold times for both input and output, but in theory
    it should work. You'll need to connect 6 lines back around: DI2 to DO0,
    DI3 to DO1, etc. Then you'd input on DI0 and 1, and get stuff out on
    DO6 and 7.
  3. Tam/WB2TT

    Tam/WB2TT Guest

    I don't think so. After you write the first 2 x 512 bits, the FIFO will be
    full. To do any more writes, you would have to do a SO/SI. If a real read
    now comes along, you won't know which bits to look at. This has been done
    before, with multiplexers and 8 bit latches input and output. Only problem
    is if the sending end stops completely.

  4. Tim Wescott

    Tim Wescott Guest

    Oh damn. You're right. The only time that FIFOs and I crossed paths
    was in a fixed delay line, where the reads and writes happened
    simultaneously -- so I kinda forgot that you could do it asynchronously...
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