Re: [IBIS-Users] IBIS-SPICE correlation

Mohan,
                Try adjusting the input levels Vil and Vih on the IBIS
models. I think that will solve the problem.

Regards
Kannan

Mohan, Prabhu wrote:

>Hi
>I am trying to correlate IBIS vs. Spice. The simulation seems to be off on
>the rising edge. IBIS seems to start switching a little bit earlier than
>Spice on the rising edge (refer the attachment, red-IBIS, yellow-SPICE). I'm
>not sure what is causing it. Does anyone have any suggestion as to where the
>error might be coming from?
>Thanks
>Prabhu
>
>-----Original Message-----
>From: Muranyi, Arpad [mailto:arpad.muranyi@intel.com]
>Sent: Friday, March 12, 2004 9:59 AM
>To: Ibis-Users (E-mail)
>Subject: [IBIS-Users] RE: Question regarding .pkg versus simple RLC
>
>
>Frank,
>
>>From a syntax point of view, you can make models with the
>same exact data in all formats (if you use the lowest
>common syntax). However, since the more elaborate formats
>allow you more detail, chances are that you will not find
>numerical matches. It will all depend on the extraction
>methodologies, and assumptions.
>
>Arpad Muranyi
>Intel Corporation
>==========================================================
>
>
>
>
>
>> -----Original Message-----
>>From: Frank Dunlap [mailto:owner-ibis-users@eda.org] On
>>
>>
>Behalf Of Frank Dunlap
>
>
>>Sent: Wednesday, March 10, 2004 6:09 PM
>>To: Ibis-Users (E-mail)
>>Subject: Question regarding .pkg versus simple RLC
>>
>>Presumably, a .pkg file provides "more" information than the simple
>>
>>
>RLC in the [Pin] section of an IBIS model. Assuming that's the case, do
>simulators actually take advantage of this additional information? Are
>there cases where a .pkg file is preferred? Are there cases when it's
>not preferred, such as where its added complexity may cause problems?
>
>
>>Furthermore, is there a straightforward relationship between RLC
>>
>>
>values that would appear under the [Pin] section in an IBIS model, and
>corresponding values that would appear in a .pkg file?
>
>
>>Here's an example from the [Pin] section of an IBIS model:
>>
>>[Pin] signal_name model_name R_pin L_pin C_pin
>>AE6 HINT# V33OP 2.170 8.506nH 6.636pF
>>AE5 HRW# V33OP 2.165 8.475nH 5.865pF
>>C16 S_A00 V33OP 1.332 3.287nH 3.472pF
>>
>>Here's an example from a .pkg file:
>>
>>[Resistance Matrix] Banded_matrix
>>[Bandwidth] 0
>>[Row] 2255
>> 1.74791e+000
>>[Row] 2253
>> 1.74386e+000
>>.
>>[Inductance Matrix] Sparse_matrix
>>[Row] 2255
>>2255 1.21125e-008
>>2253 1.70009e-010
>>B19 1.73505e-010
>>[Row] 2253
>>2253 1.25283e-008
>>J21 1.22831e-010
>>F20 1.89512e-010
>>K21 4.09167e-010
>>.
>>[Capacitance Matrix] Sparse_matrix
>>[Row] 2255
>>2255 4.40327e-012
>>2253 -2.82931e-015
>>B19 -1.47570e-015
>>[Row] 2253
>>2253 4.33757e-012
>>J21 -1.04449e-014
>>F20 -2.65107e-015
>>K21 -8.93602e-015
>>
>>
>>The .pkg and [Pin] information are from two different data sets. I'm
>>
>>
>sorry, but I don't have both .pkg and [Pin] information from a common
>data set.
>
>
>>Thanks in advance for any guidance,
>>
>>Frank
>>
>>
>>
>
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Received on Mon Mar 15 16:00:49 2004