Re: [PARPORT] X-flag and it's use...

From: Tim Waugh (
Date: Fri May 11 2001 - 09:42:04 EDT

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    On Fri, May 11, 2001 at 09:17:40AM -0400, Mark Cianfaglione wrote:

    > I have a device here which seems to use the X-flag pin of ECP and I was
    > wondering if we do anything with it. I looked into the source for the
    > parport driver and it wasn't to clear what it's use is. From what I
    > understand it's an extensibility capability indicator. Am I way off the
    > mark?

    Xflag is a signal used by the peripheral during negotiation to accept
    or reject a negotiated mode. It's low to accept nibble mode, and high
    to accept everything else.

    You can use the parport IEEE 1284 implementation to negotiate with
    extensibility requests by using (IEEE1284_EXT_LINK | mode) as the
    requested mode for parport_negotiate.

    Does that help?


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