RE: [SI-LIST] : PCI CLK trace length limit

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Wed Dec 13 2000 - 04:26:21 PST


> Revision 2.2 of the PCI spec. paragraph 4.4.3.1 indicates that the limit
> is
> 2.5 in +/- 0.1 in.
>
> Is the 0.1in tolerance correct?
 
Yes, the +/- 0.1 inch is correct, and, in my opinion, quite reasonable.
2.54 mm.

> Is it necessary to verify the trace length,
> including vias, for each design?
 
If the spec says the length must be 2.5 in +/- 0.1 in, then yes, you need to
guarantee a length in that range for each design, whether you do it manually
or the tools do it for you. (How many designs do you have?) It should be a
simple thing to check. Most routing tools let you do it quickly.

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