Hi All, I was wondering why are the ibis series switch devices used in the DDR2 designs. Thats the first question. I am aware of the ibis models with the series switches and their usage in the SI simulations. From a logic and design point of view, why are they needed? I have come across a complex switch model from TI, ts3l500ae, link provided below. http://focus.ti.com/docs/prod/folders/print/ts3l500ae.html It has two series switches for a single net and it has two functions. Can someone please educate me on these usage and implementations in the designs? Thanks, Sivaram ------------------------------------------------------------------ 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