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Re: Microstrip line for PCI clock !!?

>Every card must have it to control the clock skew.  If some cards use
>0.5" and others use 4", they won't see the PCI CLK at the same time, and
>this can cause timing violations, which could hang your computer.

What I don't understand is why isn't PCI timing specified to be
relative to the time of arrival of the clock edge at the PCI edge
connector.  If done that way, designers then will have the flexibiliy
to make delay trade offs between delay in the ASIC and delay in
the PCB trace.