[SI-LIST] Re: ADDITIONAL PCI CLOCKS
- From: "S. Weir" <weirsp@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 13 Jul 2001 14:55:50 -0700
Frank,
I would vote for using one driver to two loads that are close enough to
each other that the stub will not introduce a substantial step, and are
part of the main board.
Regards,
Steve.
At 03:37 PM 7/13/01 -0700, you wrote:
>Why not drop the resistor and make the two branching traces 2x the line's?
>
>Frank Paglia
>
>-----Original Message-----
>From: Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxxxxxx]
>Sent: Friday, July 13, 2001 2:50 PM
>To: 'si-list@xxxxxxxxxxxxx'
>Subject: [SI-LIST] Re: ADDITIONAL PCI CLOCKS
>
>
>
> > I thought of using one of the PCI outputs of the
> > synthesizer to drive two PCI devices as follows:
> > The output will be given to a resistor (value equals
> > half the line's characteristic impedance minus the
> > driver's source impedance). The other end of this
> > resistor will then be split into two traces that are
> > routed to the individual PCI devices.
>...
> > Is there
> > something I ought to care of?
>
>Don't forget to check what happens when one of those PCI load devices isn't
>there (PCI card not plugged in). Or make sure that those outputs don't go
>to plug-in cards.
>
>Instead of one resistor with half the resistance, you could use two
>resistors of (about) the same resistance as the others, thus giving you some
>isolation between the two clocks.
>
>Andy
>
>
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