[SI-LIST] Re: SI Clarifications
- From: "Ingraham, Andrew" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 11 May 2004 10:59:33 -0400
> 1) We design WLAN cards with PCI as the host interface.Threre is a 33 Mhz
> clock which comes from the CPU to the pci edge connector of our card as a
> part of pci standard.I have seen on quite a few ethernet cards( NIC cards)
> in which this 33 mhz clock signal from CPU comes to the ethernet cards
> edge connector is taken to the internal ciruitry through a curved path
> (with some 5 to 6 curves) and not as a straight line.Pls clarify as how
> this helps the signal integrity.
It is not precisely for "signal integrity." The PCI clock trace must be 2.5
inches (+/-0.1 inch) long on the PCI card. The curves make this 2.5" trace
fit.
Andy
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