Hello, Saril, Simulation is important for determining an acceptable termination scheme, especially with multiple drivers on a bus. For example, simulation will show that placing a series resistor in the middle of a long trace produces no improvement in signal integrity. Since only one driver is driving at a time, one would do one simulation suite for each driver. Remember that each time a trace branches, there is an impedance discontinuity. Once you have a layout, you will probably want to run post-layout simulations. Regards, Lynne "IBIS training when you need it, where you need it." Dr. Lynne Green Green Streak Programs http://www.greenstreakprograms.com 425-788-0412 lgreen22@xxxxxxxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Saril Sent: Friday, March 02, 2007 12:30 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Termination Topology for Bidirectional Bus Hi, What would be the best termination topology for a Bidirectional Data bus? Is it a good thought to place the series termination resistor in the middle of the trace? Also when there are mulitple devices on the bus how can we boil down the SI issues. Its clear that HyperLinx can help on this but, it would be great to know a generic rule. Thanks in advance.. Best regads Saril Kaiprath Design Engineer Fkextronics Design, Bangalore ____________________________________________________________________________ ________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net 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 or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net 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