| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 657.1 | Modular Computing aka DMCC: see http://www.digital.com/info/oem | BBPBV1::WALLACE | john wallace @ bbp. +44 860 675093 | Mon Mar 10 1997 09:10 | 19 |
| Hi Bruno,
You could try the first few replies in topic 38 in NESBIT::MODULAR.
My Summary: a piece of silicon which allows the limited number of
interrupt pins on a PICMG CPU card to be used to encode up to 64 "IRQ"s
from 16 PCI slots. Without the interrupt accelerator the OS would have
to poll all the possible interrupting devices to see whose interrupt to
service. This is (a) unpredictably slow (b) not possible on certain
Alpha OSes (which don't have the infrastructure or driver support for
shared interrupts).
PICMG = PCI Industrial Computer Manufacturer's Group?
Applicability today: Alpha PICMG CPUs on Digital-supplied (or licensed)
PICMG backplanes.
regards
john
|
| 657.2 | also, the IA is on all our backplanes, not just the 19 slot | RLTIME::COOK | | Mon Mar 10 1997 11:46 | 14 |
|
> Applicability today: Alpha PICMG CPUs on Digital-supplied (or licensed)
> PICMG backplanes.
We also sell an Intel PICMG CPU card.
BTW, we publish the spec on the interrupt accelerator so anyone who want to
utilize that technology with our backplane or to incorporate it into their
backplane can do so.
ac
|
| 657.3 | Intel inside => interrupt accelerator ignored | BBPBV1::WALLACE | john wallace @ bbp. +44 860 675093 | Mon Mar 10 1997 12:46 | 6 |
| Yes indeed we do (re)sell Intel PICMG CPU cards but so far as I'm aware
they make no attempt to use the Interrupt Accelerator facilities. Hence
my comment about applicability. Corrections+clarifications welcome.
regards
john
|
| 657.4 | | RLTIME::COOK | | Mon Mar 10 1997 13:08 | 10 |
|
> Yes indeed we do (re)sell Intel PICMG CPU cards but so far as I'm aware
> they make no attempt to use the Interrupt Accelerator facilities. Hence
> my comment about applicability. Corrections+clarifications welcome.
I had been told that the latest Intel cards supported the IA, but I just
confirmed that you are correct.
ac
|