For a Len=0 ebd section, I would suggest modeling the L and C as a pi circuit, because of it's symmetry. I believe this is what most IBIS simulators do. If a specific directionality is required two seperate sections can be provided in the model. For example, for an L followed by a C: Node A Len=0 L=2 Len=0 C=1 Node B regards, scott p.s. - for quick access to all things IBIS, we've provided the following page on our website for the engineering community, which Bob Ross keeps updated on a regular basis. http://www.teraspeed.com/ibis_resources.html -- Scott McMorrow Teraspeed Consulting Group LLC 2926 SE Yamhill St. Portland, OR 97214 (503) 239-5536 http://www.teraspeed.com Jon Powell wrote: >I think you are right. There is not enough information. Ideally if this is >supposed to be a distributed transmission line it would be defined in terms >of Z S and Length. With L C and length you can translate to Z S and length >and then you would not have the lumped problem. >If this was really supposed to be discrete L and C elements there should >have been more nodes defined to give order. > >regards, >jon > >(ps: Len=0 is rather suspicious at any rate, that being impossible in a real >world situation). > > >-----Original Message----- >From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On >Behalf Of cat >Sent: Monday, September 22, 2003 4:37 PM >To: si-list@xxxxxxxxxxxxx >Subject: [SI-LIST] Re : maybe something wrong in ebd defination? > > > Oh, I am really eager to know the answer.And if you are not sure,I still >hope you can communicate with me.If there is something wrong totally,please >let me know. > >resend the message: > > I think the description of [path description]section of the ebd file is >not detailed enough.I got confused when I meet such condition: >Node A >Len=0 L=2 C=1 >Node B > >Should I represent it like this: > > > B <---@@@@@----------|--------------->A > L=1 | > | > === C=1 > | > --- >or like this: > > > B <-------|------------@@@@@------------>A > | L > | > | > =====C > | > --- >By the way,should the capacitor be connected to ground or power? How to >determine this ? >In fact , I found many cases like the above one in the DIMM ebd file >supplied by molex. >Maybe both representation is just the same? Or there is some description I >did not noticed?Or this is really a oversight? >any response will be appreciated. > cat > cat_carl@xxxxxxxxx > 2003-09-19 > > With 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 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 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 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