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MMC card clock question

Discussion in 'Electronic Design' started by markp, Jan 26, 2006.

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  1. markp

    markp Guest

    Hi All,

    Anyone out there know what happens when you default the CLK line of an MMC
    card to low rather than high? I have an existing design that uses this
    mode - it works for some MMC card manufacturers, but every now and then
    it'll fail for others. Just wondering whether the MMC cards actually use the
    falling edge for things (for example, they could clock the 'waiting' data
    out on this edge to guarantee 5ns setup and hold to rising edge).

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