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Discussion in 'Electronic Design' started by RobertP, Feb 17, 2004.

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  1. RobertP

    RobertP Guest

    Does someone know if there is a way to force SDRAM chip data outputs
    into High-Z state asynchronously? Is asserting CS inactive sufficient?
  2. No (unless I've misinterpreted the JEDEC standard). The only
    asynchronous input is CKE, and deasserting CKE alone won't do what you
    want. You may want to have a look at the relevant standards at
  3. No.

    We had problems when a CPU watchdog fired in the middle of a burst
    transfer - the DRAM outputs stayed active and the Boot Flash could not be
    read anymore.
    The problem was solved with some glue logic in a CPLD that gave off an abort
    cycle to the SDRAM when the reset did tri-state the micro's outputs.

    Arie de Muynck
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