On Sun, 28 Nov 2004, Lee wrote:

> So my question remains: Is PCI 2.2 a requirement to use the TDM400P
> card? If so, where is this specified? If not, is there a performance
> difference when using PCI 2.1?

PCI 2.2 is mostly a clerification on the 2.1 specification. One difference 
that may be important is that the 3.3V rail was made mandatory even in a 
5V slot. In PCI 2.1 it was optional.

Since the PCI 2.2 specification is tighter with a less ambigous language 
it is probably safer to require 2.2 as a manufacturer of PCI cards. There 
is less risk of implementational incompatibilites. Most likely the cards 
will work fine in a 2.1 slot.

Peter


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