Re: Level / edge interrupts

["sharon kleiman" <kleimansharon@surfree.net.il>]

Dear Sir,
As I recollect PCI IRQ# = = INT A,B,C,D are only level in the PCI. look at
the chipset data sheet,
By definition the ISA IRQ# are edge.



----- Original Message -----
From: Steve Turner <steve.turner@motion-media.com>
To: <pci-sig@znyx.com>
Sent: Thursday, June 08, 2000 11:50 AM
Subject: Level / edge interrupts


> Dear PCI-SIG members,
>
> I believe this is the correct forum for the following Question
> My company produces a PCI plug in card that works on 99% of PC's (Uses
> Philips SAA7146 PCI interface)
>
> On one machine we get some extraordinary behaviour. A card plugged into
one
> particular slot causes the PC to reboot during normal operation in Windows
> 98. (Black screen - BIOS boot) In other slots applications running on our
> card are unreliable. Its is all very bizarre.
>
> (a) Via Chipset
> (b) Intel P2
> (c) Award Bios 1.0a
>
> The award bios gives incredible flexibility not normal with a BIOS.
> Experimentation has revealed the following (not normally possible to
change
> this with AMI BIOS)
>
> PCI IRQ = level sensitive, perfect
> PCI IRQ = edge sensitive, system failure
>
> It would however be nice to know why?
> Can anybody shed any light on this?
>
> Thanks in advance
>
> -------------------------------------------------------
> Stephen Turner  : steve.turner@motion-media.com
> Motion Media Technology Ltd, Horton Hall, Horton,
> Sth Glos BS37 6QN
> URL:    http://www.motion-media.com
> DIRECT: +44(0)1454 338504
> SWB:    +44(0)1454 313444           FAX: +44(0)1454 313678
> -------------------------------------------------------
>
>