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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu