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SDRAM stable ?

Discussion in 'Electronic Design' started by Boki, Oct 17, 2005.

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  1. Boki

    Boki Guest

    Hi All,
    Do you ever experience SDRAM not stable in mass production?

    Best regards,
  2. Pooh Bear

    Pooh Bear Guest

    Never used the stuff myself ( except in my PC of course ).

    I expect that means you have a problem ? I'd expect you need to look at
    timing issues maybe.

    Did you finally manage to work out the volts and amps needed to produce 1
    watt in an 8 ohm speaker btw ?

  3. Boki

    Boki Guest

  4. PeteS

    PeteS Guest

    I have never had issues with SDRAM or DDR that was in production in the
    last 10 years or so. Of course, if you are buying from a 're-labeller',
    your results may vary.

    My experience is for units in production (still are as far as I know, 6
    different products, multi source parts) with >100k parts per year for
    SDRAM and >500k parts per year for DDR.

    A re-labeller is a nice name for an outfit that takes known bad batches
    of parts, re-labels them and then sells them.


  5. Boki

    Boki Guest

    Thank you very much for advice.

    I am still finding the problems...

    Best regards
  6. Boki

    Boki Guest

    I have find out the root cause, when we add bead for EMI / ESD, we
    increase the rising / falling time on SDRAM data pin.

    I remember the ESD test will fail when the ESD test signal comes from
    memory card slot(so we add those beads/resistors), but I can't sure
    they are for EMI or ESD.

    btw, the problem is timing, but it seems that do not to change the
    layout now, or we have to re-test the EMI/ESD/XXX/@@@, how do you think
    change a high speed SDRAM directly? any other ideal?

    Thank you very much!

    Best regards,
  7. Boki

    Boki Guest

    ha, that project is running again.

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