Hi Jeremy, What values do you use for fwf_tune and rwf_tune in your simulations with Hspice? Thanks Jim Freeman Jeremy Plunkett wrote: > Todd, > At a minimum, ServerWorks' IBIS models are validated prior to release by: > > 1) Syntax check using Hyperlynx Visual IBIS editor. > 2) Correlation to the original spice deck waveforms using the hspice B > element. In the past, the degree of correlation has not been quantified > because typically it is all-or-nothing; either the waveforms are a 99% > match point-for-point (inspected visually in Awaves), or there was some > serious problem in the conversion that needs to be corrected. Occasional= > ly, > there are correlation issues caused by limitations of the IBIS format or = > the > extraction process; in these cases we determine a work-around such as > changing which model data is included in which curves, adding a submodel, > etc. When a standardized method of correlating the IBIS results to spice= > is > determined by the IBIS qualification committee I would be happy to includ= > e > it in our correlation process, provided it can be accomplished either usi= > ng > hspice MEASURE functions such as DERIVATIVE, ERR, etc, or using a softwar= > e > utility that can import the waveforms from a text file. > > After the initial release, our models are converted to various other form= > ats > in-house and by our customers, which can sometimes bring out correlation > issues between different simulators or problems with the model conversion > processes. Also, at some point after the initial release the models are > correlated with silicon and corrected if necessary. > > Serverworks has the same situation that Adam Tambone mentioned in his > posting, a large library of existing IBIS models(though not as large as > Fairchild's), not all of which were generated or correlated to the same > level of scrupulousness that we currently follow. In our case most of th= > ese > parts are no longer being used in new designs, so fixing problems in the > IBIS models is a low priority, however we will address any issues with an= > y > of our models as customers request it. > > To any customers who may be reading this: feel free to address any feedba= > ck > regarding ServerWorks' IBIS models directly to me (preferably privately, = > not > to the whole SI list). However, please address requests to receive the > models in the 1st place to our marketing dept. > > Jeremy > > |>--/\/\/--((((((((()--|> > > Jeremy Plunkett > Signal Integrity Engineer > ServerWorks Corp > www.serverworks.com > > |>--/\/\/--((((((((()--|> > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Todd Westerhoff > Sent: Monday, March 25, 2002 12:59 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] IBIS Model Quality (or lack thereof) > > Hi all, > > We have been doing a lot of comparisons between IBIS and HSpice models > lately, with a lot of less-than-satisfactory results. > > I have an open question for the semiconductor suppliers among us: > > What testing is performed after an IBIS model is created, to ensure that = > the > completed model behaves as expected? I'm interested in responses from > vendors that actually SIMULATE the IBIS model before distributing it for > customer use. It looks to me as though many of the models I've received > were never used in a simulation before being released ... and, as a > potential customer, I find that quite disheartening. > > So the question is - what processes are being used to test IBIS models an= > d > ensure they function properly before their release to customers? > > As always, replies both on and off the list are greatly appreciated. > > Todd. > > Todd Westerhoff > Signal Integrity Engineer > Hammerhead Networks > 5 Federal Street - Billerica, MA - 01821 > email:twester@xxxxxxxxxxx - ph: 978-671-5084 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > "I=92m starting With the man in the mirror > I=92m asking him to change his ways > And no message could have been any clearer > If you wanna make the world a better place > Take a look at yourself, and then make a change" > > - "Man in the Mirror", Michael Jackson > > ------------------------------------------------------------------ > 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