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Jim;
I think Mark has it correct. The INTRQ is an active high signal, and when it is
released, it is not driven down, but released from driving. The PU will keep
this from floating down which will keep the edge-trigger from seeing a potential
rising edge later.
Rick Kalish
ALi
Jim Castleberry <[EMAIL PROTECTED]> on 09/28/2001 08:25:49 AM
Please respond to [EMAIL PROTECTED]
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
cc: "'Keith Clausen'" <[EMAIL PROTECTED]> (bcc: Richard
Kalish/AAL_SJC/ACER)
Subject: [temp t13] Re: ANSI NCITS 340-2000 (ATAPI-5): INTRQ
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Mark,
I don't follow you. A pullup *will* cause a positive-going glitch if
INTRQ is deasserted (low) when it is released. A pulldown will not
cause a positive-going glitch whether INTRQ is asserted or not. Right?
jcastle
On Fri, Sep 28, 2001 at 07:42:56AM -0700, Evans, Mark wrote:
> I know of at least two different host-side implementations for sensing
> INTRQ. One implementation uses a positive going, edge-triggered receiving
> device. This implementation requires a pull-up resistor so that there will
> be no positive-going glitch when INTRQ is released (nIEN set to one, or
> between the time one device releases INTRQ before the other device negates
> INTRQ). The second implementation uses a positive level sensing receiving
> device. This implementation requires a pull-down resistor so that there
> will be no positive level sensed for any reason except when actually
> asserted by a device.
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