> Now whether you can chain a PCI bridge off a PCI
slot
> is another matter. I don't know if you can. So I
may
> just be flapping my jaw here... (IRQ's would be a
> limitation wouldn't they?)
This is possible - for example I have a PCI four port
network card (a D-Link DFE580TX). This card has four
ethernet controller chips and if you look at the
board, the big chip in the middle is an intel PCI-PCI
bridge. Doing an lspci in linux shows the bridge is on
PCI bus 0, and the four etherner controllers on bus 1.
This technique of bridging the slot bus to another PCI
bus internal to the card to allow several devices
which each need their own IRQs, etc. To fit onto a
single card is commonplace in many multifunction
server cards. e.g. remote management cards or the
cards that do ethernet, SCSI and VGA all in one.
HTH
-Taiyo
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