RE: [IBIS-Users] Series Pin Mapping

Hi Eric,

You have to be careful with using model selectors in Series Pin Mapping as
some commercial EDA tools don't support it although I believe it is valid
from the IBIS Spec point of view. Depending on what tools you have available
you may want to try out your various implementations to make sure they are
going to work.

Best,

Timothy Coyle

President

Signal Consulting Group LLC

405 Western Ave #430

South Portland, ME 04106

Tel: 617.297.2566

Email: <mailto:tim.coyle@siconsultant.com> tim.coyle@siconsultant.com

Web: <http://www.siconsultant.com/> http://www.siconsultant.com

 <http://www.sharksim.com/> SharkSim - Signal Integrity IBIS Modeling
Software

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Eric Monteiro
Sent: Wednesday, March 17, 2010 3:07 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] Series Pin Mapping

Hello

I have a differential input that has 2 different models in the model
selector. In addition, this model makes use of the series pin mapping
keyword. The issue I am having is that the 2 derivatives have different
series models. The IBIS parser does not complain (though I'm skeptical),
but is the following valid?

[Pin] signal_name model_name R_pin L_pin
C_pin

1 SDI_IN SDI x
x x

2 SDI_INb SDI x
x x

[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max

1 2 NA NA NA NA

[Series Pin Mapping] pin_2 model_name

1 2 sdi_input_term

[Model Selector] SDI

model1 description

model2 description

[Model Selector] sdi_input_term

model3 description

model4 description

The goal is for when the user selects SDI model1, the must also select
sdi_input_term model3.

Thanks in advance,

Eric

  _____

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Tom Dagostino
Sent: Wednesday, March 17, 2010 12:17 PM
To: 'ji xiao'; ibis-users@eda.org
Subject: RE: [IBIS-Users] question about IBIS simulation for a complete
inverter

Ji

Historically IBIS Signal Integrity simulators are not designed to simulate
the transfer function of the parts in the nets you are simulating, they only
concern themselves with the interaction of the I/O buffers and the
transmission line medium that is between them. There is no description of
the logic function, delay or any of the other requirements that may be
needed to generate the timing of signals from input to output in an IBIS
model. There are some timing simulators that do at least some level of
input to output simulation.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065

503-430-1285 FAX
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of ji xiao
Sent: Wednesday, March 17, 2010 8:06 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] question about IBIS simulation for a complete inverter

Dear Sir/Madam,

As a beginner worked with IBIS model, I met a problem about the IBIS
simulation for a complete device. Let's take an inverter as an example. If I
want to model a complete inverter including the transfer function by using
IBIS, do I just need to simulate the output model only(i.e. does the output
model contain the transfer function) ? or cascade IBIS input model with
output model?
If we need to cascade them, does that mean just to receive the output signal
of the input model as the input signal of the output model?
 
Thanks and regards,
Ji Yuancheng

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