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From: CSE KITS (kitscseYAHOO.COM)
Date: Wed Oct 17 2001 - 14:41:53 CDT

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    Hi,
       I am using a GemPC 410 SL reader with a
    experimental setup as a smart-card. I have a chip
    connected externally which does the communication with
    the reader.
       I am having certain problems as the reader responds
    by saying that the card is unresponsive.( Status
    0x80100066H). My question is this,

    What is the Baud rate to be used while sending the ATR
    to the reader?

    According to the ISO 7816-3 standard, a single bit
    duration must be 372 times the duration of a clock
    pulse (during RESET).
    I have read else where that during ATR, the baud rate
    to be used is 9.6kbps. If we combine both of these we
    get a Clock pulse of 3.5712 M.Hz, which falls in the
    permissible range.
    However, while experimenting I have found out that on
    the clock pin of the reader I am getting a clock pulse
    of approx. width 1.6 micro seconds, which equals a
    clock speed of around .625 Mhz. Now, this does not
    fall under the permissible range.

    I would like to know exactly what the baud rate should
    the Card utilise while sending the ATR to the reader.
    Also, if any gemplus people could help me, I would
    like to know what clock the reader (GemPC410)applies
    while powering up the card.

    Thank you,
    regards,
    Ravi.

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