Hi Mohamad, Vias cause delay and some signal quality issues( a little of overshoot, undershoot and reflection) In high speed bus, you must equal to number of vias each member net of bus. You can see amount of skew with transmission lines simulation tools. Regards, FERHAT YALDIZ HARDWARE DESIGN ENG. TUBITAK -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Mohamad Haghtalab Sent: Saturday, April 04, 2009 12:34 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Via and Skew Hi all what's the effect of different number of vias (in various nets of one BUS) in producing Skew? thanks for Help Best Regards ------------------------------------------------------------------ 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