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March 2001

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Subject:
Info about PCI specs
From:
Bolis Bortolo BB PCBDesign <[log in to unmask]>
Reply To:
DesignerCouncil E-Mail Forum.
Date:
Tue, 27 Mar 2001 11:40:01 +0200
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A customer of mine ask me to design a PCI board starting from a sample board
designed by "Oxford semiconductor". As in many other PCI boards that I
designed I followed the PCI specs about traces lenghts ( 1.5 inches for
interface data signals and 2.5 +- 0.1 inches for the clock ).
Checking the job I discovered that the sample board from OS doesn't follows
the PCI specs ( i.e traces more long particularly for high address
a26-a31...)
Investigating I discovered the same situation in other boards like one from
Conexant and Brooktree ( this one designed by Praegitzer Design )
So my question is:
Are those boards out of specs or what are the really tollerances about
lenghts?
best regards


Bolis Bortolo
BB PCB Design
Via Gasparoli, 53
21012 Cassano Magnago ( VA ) - Italy
Tel. +39 0331 281457 Fax +39 0331 202794
Email [log in to unmask]

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