Lpc2000

Did a lung tumour on a little 10yo last nite at Kids hosp wmead.
dozens of mets all thru the lung already so it was palliative - lovely young
parents just totally exhausted of emotion, like anaesthetised.
More Ewings Sarc.
We are so lucky to have healthy kids
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
XXOO

----- Original Message ----- 
From: "roger_lynx" <roger_lynx@...>
To: <lpc2000@yahoogroups.com>
Sent: Wednesday, March 15, 2006 11:35 AM
Subject: [lpc2000] Re: spurious interrupts on LPC


> --- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@...> wrote:
> >
> > Jaya,
> >
> > I forwarded your question to the author of the FAQ because I do not
> > know the answer out of own experience. The Application Note makes
> > the clear statement that it is a general ARM7TDMI - VIC problem.
> > For those interested in the detailled application note that
> > describes how to handle spurious interrupts:
> > http://www.standardics.philips.com/support/documents/microcontrollers
> > /pdf/an10414.pdf
> >
> > We would however greatly appreciate if you would provide your
> > knowledge by investigating competitor devices using the VIC and
> > telling this community if this is not a general ARM VIC as stated in
> > the Application Note by running the same code on a competitor device
> > not showing the problem and on a LPC2000 device, showing the issue.
>
> Hi Robert,
>
> That is a fair challenge.
>
> > We do experience the problem and consider it a general issue, not
> > specific to the LPC2000. If competitors do not mention it, it does
> > not mean it does not exist there.
>
> Right. And if ARM says:
> "If an interrupt is received by the core during execution of an
> instruction that disables interrupts, the ARM7 family will still take
> the interrupt. This occurs for both IRQ and FIQ interrupts."
>
> The question is, since the pipeline is three-staged, at which point
> the interrupt (IRQ/IFQ) is being sampled after fetch, decode or
> execute cycle? I would imply int. sampling happens after execute.
> Would someone clarify this ARM statement, please?
> Thanks.
>
> Best regards
>
> Roger
>
>
>
>
> >
> > Best regards, Robert
> >
> > --- In lpc2000@yahoogroups.com, Jayasooriah <jayasooriah@> wrote:
> > >
> > > Dear Robert,
> > >
> > > In the FAQ you referred to, on "ARM7DTMI-S Core", to the FAQ:
> > >
> > > "Can spurious interrupts occur in the LPC200?",
> > >
> > > Your answer is:
> > >
> > > "Yes, spurious interrupts can occur in any ARM7 device that has
> > implemented
> > > the ARM Primecell Vectored Interrupt Controller (VIC)."
> > >
> > > I tried looking for a reference to this in the ARM site but cannot
> > find any.
> > >
> > > A search on "spurious" at the ARM web site yields 11 hits but
> > these appear
> > > not relevant to the VIC and spurious interrupt problem with the
> > ARM design
> > > that you seem to allude us to.
> > >
> > > I also did a brief search for information on the web relating to
> > spurious
> > > interrupts, and all the examples seem to point to LPC one way or
> > another.
> > >
> > > A spurious interrupt is a hardware interrupt which is generated by
> > system
> > > errors (http://www.answers.com/topic/interrupt-1), and systems
> > with
> > > spurious interrupts in general do not meet compliance requirements.
> > >
> > > Please clarify:
> > >
> > > 1/  Is this spurious interrupt problem an error in LPC
> > implementation of
> > > VIC or is it an error in ARM Primecell VIC specifications itself?
> > >
> > > 2/  Can you tell us if there are any other ARM cores with VIC that
> > also
> > > suffer from spurious interrupts problem that the LPC suffers from?
> > >
> > > Kind regards,
> > >
> > > Jaya
> > >
> > > PS:  I realise there has been discussion previously on spurious
> > interrupts,
> > > but none seem to throw any light on whether this is a problem
> > specific to
> > > LPC or it has to do with with ARM VIC design itself.
> > >
> > > --- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@>
> > wrote:
> > >  >
> > >  > Hi,
> > >  >
> > >  > have a look at the FAQ here:
> > >  >
> > >  > http://www.standardics.philips.com/support/faq/microcontrollers/
> > >  >
> > >  > I also added a link in the link section named
> > >  > "Philips FAQ for LPC2000 devices"
> > >  >
> > >  > Regards, Robert
> > >
> > > Send instant messages to your online friends
> > http://au.messenger.yahoo.com
> > >
> >
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