Messages in this thread | | | Date | Tue, 21 Sep 1999 23:41:11 -0600 (MDT) | From | Jason Gunthorpe <> | Subject | Re: Linux and real device drivers |
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On Wed, 22 Sep 1999, Steve Underwood wrote:
> There is a proper standardised 66MHz variant of PCI, which is used on a > lot of Alpha, and (I think) Xeon boards. There's 64bit PCI, too, with an > extra connector for the extra lines. Most dedicated x86 users seem > unaware of these.
There is another standard on the horizon called PCI-X that will be 133Mhz and 64bit. The NGIO/Future IO people also promise hugely fast interconnects.
> 66MHz PCI is actually somewhat troublesome. Most real 66MHz > implementations seem to have just 2 card slots per bus. That only just > scrapes through the definition of a bus. Add more slots and things get > flakey.
PCI-X will have one slot :> There are ways to extend this with signal boosting and other tricks though.. For instance you gan get >5 slot PCI back planes without a bridge chip. I think the plan to get more slots is to basically have a switching chip that can handle multiple busses at once.
July's issue of RTC had a nice set of articles on PCI past, present and future, very interesting.
Jason
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