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Re: Spread Spectrum Clocking

Ben,

This was discussed in depth here a while back.
The conclusions:
1) Some mother boards do this.
2) It does not violate the PCI spec.
3) PCI cards can not use a PLL type (0 Tpd) of clock buffer chip,
they would be in violation of the PCI spec if they did.
Hope this helps.

-Ivor

At 11:06 AM 1/31/97 -0800, you wrote:
>Hello PCI Community,
>
>I've heard that there are systems out there
>using 'spread spectrum clocking' technology
>in order to pass FCC EMI testings.
>
>I would like to get some feedback on how common
>this practice is done in the PCI world, especially
>for the ones who build motherboards which
>provide PCI slots.
>
>Would this violate PCI specs in any way?
>
>Thanks.
>
>- Ben -
>
>_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
>  Benson Cheung           (bcheung@adobe.com)
>  Adobe Systems Inc.
>  Printing & Systems Division
>  M/S  P05
>  303 Almaden Blvd.
>  San Jose, CA  95110-2702
>  (408) 536-2872            (408) 537-8411  (FAX)
>_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
>
>
>
-Ivor

--------------------
standard disclaimer:
I speak for myself and my views may not be the same as my employer's.
Ivor Bowden
Peritek Corp
phone: (510) 531-6500
FAX: (510) 530-8563
email: ivor@peritek.com
^¤
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