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Compact Flash card pinout

Discussion in 'Electronic Design' started by Remove _ for valid address, Dec 28, 2006.

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  1. I'm trying to wire up a socket for a Compact Flash card.

    I thought it would be easy to determine which is pin 1, however
    the more I delve the more confusing it becomes. Google leads to
    various diagrams, however none look like a real card, and they
    seem designed to mislead (e.g. one shows two rows of pins with
    the bottom row labelled "Top"!) I downloaded the official PDF
    Compact Flash spec (v4) but I can't read it (it's "encrypted"
    with some acrobat scheme that my acroread can't decrypt; I wish
    people didn't do things like that...especially for a public

    Looking into the holes in the card, with the main (Canon) label
    on the top side, the groove in the plastic on the left is
    narrower than that on the right, like this:
    .. ________________________________________________________
    .. | _|
    .. `-. O O O O O O O O O O O O O O O O O O O O O O O O O |
    .. .-` O O O O O O O O O O O O O O O O O O O O O O O O O |_
    .. |________________________________________________________|

    The card has a triangle (which I would normally guess means
    pin 1) on the top left as drawn above. The mating socket also
    has a similar triangle, but it's on the other end so they don't
    correspond when mated. Crazy huh?

    As pin 1 is a ground, and ground pins on the socket are longer
    than the rest, it has to be either bottom left or top
    right. Can someone please put me out of my misery and reveal
    which. As it's going to be bastard to hand wire anyway, I don't
    wish to have to do it twice!


  2. SNIP
    Look carefully at the sides of your compact flash. There are two grooves. 1
    is fat, the other is thin. Pin 1 is on the fat side.Look at the CF module
    with the fat grove on your right. Pin 1 is in the top right hand corner.
  3. Guest

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