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SLE4442 low level protocol

Discussion in 'Electronic Basics' started by [email protected], Sep 7, 2005.

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    I need to get an ID from the SLE4442 smartcard. If needed self-written.
    Besides the fixed ID's in the card it is possible to write to the card
    according to the specification.

    I saw something funny just now. When I keep repeating the clock after 4
    bytes the following appears: 80,13,10,80,80,80,80,80,80,... But at the
    oscilloscope I don't see this repeating byte.

    I got a hint from somebody yesterday about checking the DATA-line
    during clock-cycles. According to the SLE4442-specification the
    inserted card will pull-up the line if it thinks the data if no longer
    valid or it stopped sending it.

    Is anybody familliar with this concept?

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