Please allow me to clarify my reference to fork/endfork in a package model: In the PKG format, the endpoints of the package model (pad and pin) are always pre-defined as the two ends of the interconnect. Thus fork/endfork structures are used to describe a stub. (As Weston said, the original use was to describe plating bars.) Fork/endfork never describes a branch to a second pad or pin. According to the IBIS 4.2 spec: | Subparameters: | | The Len, L, R, and C subparameters specify the length, | inductance, capacitance and resistance of each section of each | stub on a package. | | The Fork and Endfork subparameters are used to denote branches | from the main package stub. - 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 ------------------------------------------------------------------ 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