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

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From: Potwora, William (AZ75) ([email protected])
Date: Wed Dec 13 2000 - 07:55:54 PST

Andrew,

Thanks for the response. Being new to PCI designs I just needed verification
of this spec.

Bill

> -----Original Message-----
> From: Ingraham, Andrew [SMTP:[email protected]]
> Sent: Wednesday, December 13, 2000 5:26 AM
> To: 'Potwora, William (AZ75)'
> Cc: 'si-list'
> Subject: RE: [SI-LIST] : PCI CLK trace length limit
>
> > 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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