IBIS-USERS - EIA IBIS Open Forum Users Activity: RE: [IBIS-Users

From: Tom Dagostino <tom@teraspeed.com>
Date: Mon Mar 15 2004 - 16:42:06 PST

I don't think that would work. Vil, Vih only operate on receivers, not
drivers.

Tom Dagostino

Teraspeed Consulting Group LLC

Device Modeling Division

13610 SW Harness Lane

Beaverton, OR 97008

503-430-1065

tom@teraspeed.com

Teraspeed Consulting Group LLC

2926 SE Yamhill St.

Portland, OR 97214

http://www.teraspeed.com

  -----Original Message-----
  From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of Kannan
  Sent: Monday, March 15, 2004 4:00 PM
  To: Mohan, Prabhu
  Cc: Ibis-Users (E-mail)
  Subject: 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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RE: [IBIS-Users] IBIS-SPICE correlation