Re: DDR / DDR2 memory controllers

From: Anton Erasmus (nobody_at_nowhere.net)
Date: 06/25/04

  • Next message: Mike Page: "Re: Few questions on embedded stuff" 
    Date: Fri, 25 Jun 2004 21:31:12 +0200

    On Wed, 23 Jun 2004 21:10:06 -0700, Richard <rh86@azglobal.com> wrote:

    >I've got an application that's RAM-hungry (64MB+), but doesn't need a
    >lot of horsepower. Does anyone have experience using a memory
    >controller to connect an 8- or 16-bit GPIO bus to DDR or DDR2 RAM?
    >
    >
    >We've looked at hacking the timing for SDRAM - it looks workable via
    >GPIO, but it also seems to have a short future. The option of using
    >cheap DIMMs looks great (even though the sockets are pricey), or at
    >least use DDR/DDR2 chips to get better longevity.
    >
    >The question pops up occasionally about using SIMMs or DIMMs with
    >embedded systems. Generally, the consensus is "don't do it" - but why?
    >I've seen comments about the variety of modes, but don't memory
    >controllers handle this?

    Not answering your question about DDR and SDRAM, but maybe the big
    Pseudo static ram chips from Toshiba and others might be usefull ?
    Last I looked they had a 32MB version available with plans for bigger.
    64, 128 and 256MB if I recall correctly.

    Regards
       Anton Erasmus

  • Next message: Mike Page: "Re: Few questions on embedded stuff"

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