RE: [IBIS-Users] RE: (IBIS Model accuracy)

Hi Michael,
Thanks a lot for your useful explanation.I appreciate it.
- Lee

>From: "Mirmak, Michael" <michael.mirmak@intel.com>
>To: "lee yang" <changly_80@hotmail.com>, <ibis-users@eda.org>
>Subject: [IBIS-Users] RE: (IBIS Model accuracy)
>Date: Wed, 22 Jun 2005 17:00:22 -0700
>
>Lee,
>
>Thank you for your interest in IBIS!
>
>May I ask, from whom did you hear this?  The statement "IBIS is not
>accurate" or "IBIS is not accurate above xxx GHz" is very common but
>usually made without elaboration or justification.  For instance, IBIS
>accuracy in terms of what: voltage waveform correlation?  Timing?  How
>and to what standard is "accuracy" being evaluated?
>
>We have several presentations from our IBIS Summit series documenting
>and comparing IBIS performance up to 3.125 GHz.  For example:
>
>IBIS Models at 1.25 GHz and Beyond
>(http://www.eda.org/ibis/summits/jun03b/haller.pdf)
>
>Multi-Gigabit SerDes System Level Analysis Using IBIS v4.1
>(http://www.eda.org/ibis/summits/jun05/huq.pdf)
>
>In most cases, miscorrelation of simulation results using IBIS versus
>those of other model types (for example, transistor-level models) result
>from incorrect generation of IBIS data or use of data in the wrong
>context, such as "overclocking."  Some even object to IBIS because it is
>a behavioral modeling method which is more abstract than
>transistor-level models and therefore "must be leaving something
>important out."  Again, without a specific metric of comparison, this is
>essentially a philosophical rather than a technical issue.
>
>We are aware of aspects of the IBIS specification which make correlated
>model generation inconvenient or difficult, but IBIS per se does not
>suffer from an accuracy problem.
>
>I hope this helps!
>
>- Michael Mirmak
>   Intel Corp.
>   Chair, EIA IBIS Open Forum
>
>   http://www.eigroup.org/ibis/
>   http://www.eda.org/ibis/
>
>-----Original Message-----
>From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
>Behalf Of lee yang
>Sent: Wednesday, June 22, 2005 4:45 PM
>To: ibis-users@eda.org
>Subject:
>
>Hi,
>
>I heard that IBIS model can only support up to 1GHz and it is not
>accurate
>anymore if exceed 1GHz simulation. Is it true? If it is, why does this
>happen? Tools limitation or IBIS model limitation?
>Any ideas would be much appreciated.
>Thanks.
>
>- Lee Yang
>
>_________________________________________________________________
>Find love online with MSN Personals.
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