Re: PCI riser cards and PCI irq routing, etc

[Krzysztof Halasa]

Udo van den Heuvel <udovdh@xxxxxxxxx> writes:

> I will try a different case with a different dual PCI riser card soon.
> This Morex riser has DN20-31 or so, so more options.

OTOH I wonder how do they use DN 21-31? The board uses lines AD11 to AD31
(21 lines) for selecting devices #0 - #20. 32-bit PCI bus has only 32
address/data lines :-)

Perhaps they mean AD20-AD31 lines = device #9 - #0x14=20? If that is
the case, you can try:
- their "DN30" = device 0x13 = 19, which is apparently what the VIA riser
  card does,
- their "DN21" = device 0xA = 10, which could work as well.

I'm afraid both would require (different) soldering.


It's possible that the riser card includes a bridge, though. A bridge
chip can select devices differently and thus it can handle 32 devices.
-- 
Krzysztof Halasa
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