Question about PCI 2.2 spec and 3.3V signaling

[Eric_Drozdov@alliedtelesyn.com (Eric Drozdov)]

I am new to designing PCI cards and am trying to figure out a few things about
the PCI spec.  First, just to clarify that I am reading the spec correctly,
having a 3.3V card just means that the signaling on the PCI bus is at 3.3V vs
5V, not that all the IC's on the card need to work at 3.3V right?  However, I
suppose it would be ideal to have all (or at least mostly) chips that work with
a Vcc of 3.3V?  Next, where are the VIO pins(A10,A16,B19,A59,B59) supposed to
connect to on the PCB?  The previous design I am looking at for a reference here
just shows them bussed together and then coupled to GND.  I guess I don't quite
understand what these pins do or how they relate to the signaling voltage of the
card.

Thanks,

Eric Drozdov
Hardware Engineer
Allied Telesyn Int.