Re: PCI CLK Trace Length
- From: Keith <krw@xxxxxxxxxx>
- Date: Wed, 5 Jul 2006 12:45:21 -0400
In article <1152115014.930499.36170@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
PeterSmith1954@xxxxxxxxxxxxxx says...
y...@xxxxxxxxxxxx wrote:
what does the spec says about pci clock trace lengths, should it be
LIMITED to 2.5" or it should be 2.5" ?
The spec actually is silent about motherboards (well, it specifies
round trip times), but if you are designing an add-in card, the spec
(as I recall it - it's at home) is that CLK is required to be 2.5 +/-
0.1 inch. That's for PCI (R2.2) and PCIX (up to 133) 1.0a
If you are attempting to design a PCI device, I strongly suggest you
get the spec and read it. Don't say you don't have the time - you'll be
extremely lucky to get a PCI system working if you don't at least read
the physical layer spec.
Absolutely! For a more readable text on PCI (or PCI-E) MindShare
(http://www.mindshare.com) has some excellent books and eBooks.
They're not a substitute for the spec but will help understaning
the spec.
--
Keith
.
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