what does the spec says about pci clock trace lengths, should it be LIMITED to 2.5" or it should be 2.5" ?
- posted
17 years ago
PCI CLK Trace Length
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- posted
17 years ago
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) 1.0aIf 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.
Cheers
PeteS
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- posted
17 years ago
Absolutely! For a more readable text on PCI (or PCI-E) MindShare
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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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- posted
17 years ago
Yes i already have that book. But then i see some PCI clk trace w/c are 'tromboned'...
Yin