Hi Nam: I agree with Randy's response that C3 is to ground. I want to add that the EBD format also has syntax rules to bring in Series models (such as a series capacitor), if that is needed for some other configuration. Bob rrwolff@micron.com wrote: > Nam, > > Your syntax looks fine to me. Capacitor C3 would be to an ideal > ground. In fact, all capacitors are connected to an ideal ground, even > in the transmission line case, where the capacitance is part of a > transmission line that references ideal ground. > > Regards, > Randy > > > Randy Wolff > SI Modeling Manager > Signal Integrity R&D Group > Micron Technology, Inc. > > > ------------------------------------------------------------------------ > From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On > Behalf Of Nguyen, Duynam > Sent: Wednesday, August 22, 2007 1:25 PM > To: ibis@eda.org > Cc: ibis-users@eda.org > Subject: [IBIS-Users] EBD file syntax > > > > Dear expert, > > I am trying to describe the following situation in an EBD file: a signal > net that goes from a die pad to a package pin A9. Physically, this > signal net consists of two traces. Each trace is on a different layer > and they are connected together by a via which is modeled as a small > capacitor of value c3 to ground. The die > > pad and the package pin are modeled by a series L and a grounded C. > > My EBD file attempt is depicted as follows > > > > [Path Description] SIGNAL_NAME > > Pin A9 > > Len = 0 L = l1 C = c1 / > > Len = length2 L=l2 C = c2 R=r2 / > > Len = 0 C = c3 / ç Allowed ? > > Len = length4 L=l4 C = c4 R=r4 / > > Len = 0 L = l5 C = c5 / > > Node DIE.5085 > > > > I have 2 questions: > > 1. About the representation of the capacitance c3 in the EBD file, do I > violate any EBD file specification by doing this ? > > Assuming the specification allows it, would the capacitance c3 be > interpreted as grounded or in-series ? > > 2. If the representation of the capacitance c3 as above is not allowed, > can I take out the offending line and the rest is still permitted ? > > In other words, there are still two traces with an electrical > discontinuity connecting them as follow: > > [Path Description] SIGNAL_NAME > > Pin A9 > > Len = 0 L = l1 C = c1 / > > Len = length2 L=l2 C = c2 R=r2 / > > Len = length4 L=l4 C = c4 R=r4 / > > Len = 0 L = l5 C = c5 / > > Node DIE.5085 > > > > Thank you much, > > Nam > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner <http://www.mailscanner.info/>, and is > believed to be clean. > > -- > > This message has been scanned for viruses and > > dangerous content by MailScanner <http://www.mailscanner.info/>, and is > > believed to be clean. -- Bob Ross Teraspeed Consulting Group LLC Teraspeed Labs 121 North River Drive 13610 SW Harness Lane Narragansett, RI 02882 Beaverton, OR 97008 401-284-1827 503-430-1065 http://www.teraspeed.com 503-246-8048 Direct bob@teraspeed.com Teraspeed is a registered service mark of Teraspeed Consulting Group LLC -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Fri Aug 24 11:45:16 2007
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