[IBIS-Users] IBIS-SPICE correlation

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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