> 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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