Attaching to IRQ interrupts in software

[Esam]

I have a question regarding how the VME Interrupts map to the PC's 16
hardware IRQs. My device is properly setting IRQ level 6, for example,
yet I don't understand how to register for this interrupt on my
machine. Does this truly just map to hardware interrupt 6? If someone
could explain anything regarding this topic, maybe it will hit me.

Thanks

[Anton Erasmus]

On Fri, 28 Mar 2008 07:52:20 -0700 (PDT), Esam <Esa...@gmail.com>
wrote:

This can of course be implimented in various ways. The VME interrupt
structure maps naturally to the type of interrupt structure used by
Motorola processors. The PC interrupt structure is a lot less
flexible. The VME interrupts are probably handled by totally seperate
hardware, which can be programmed for one or more interrupts, and for
which a priority and vector can be assigned. This hardware would then
have one or more interrupt signals which would be connected to one or
more of the normal PC interrupt controller. So to enable interrupts
you would probablt have to set up the "VME" interrupt hardware as
well as the PC interrupt hardware. If the VME interrupts maps to one
PC IRQ, then your interrupt routine would read the VME interrupt
vector address, and use this information to jump to the correct
handler. The details vary, but this "double" set of interrupt
hardware is fairly common on VME CPU boards.

Hope this helps

Regards
Anton Erasmus

[Esam]

On Mar 28, 7:05 pm, Anton Erasmus <nob...@spam.prevent.net> wrote:
> On Fri, 28 Mar 2008 07:52:20 -0700 (PDT), Esam <Esam...@gmail.com>

Thank you, that was pretty much exactly what I needed.