RE: [IBIS-Users] Creating 3 sets of R/F Waveforms

Subject: RE: [IBIS-Users] Creating 3 sets of R/F Waveforms
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Mon Aug 18 2003 - 12:08:48 PDT

Jose,

You can make legal IBIS models with more than just two
V_fixture voltages. IBIS allows you to put 100 waveform
tables in a [Model].

I do not know how to use s2ibis, but if it only takes the
first two values, than you can make two models so that
the first model has value1 value2 and the second model
has value2 and value3. Then you can just cut and paste
the table that was generated with value3 from the second
IBIS model into the first IBIS model and you are done.

Arpad
========================================================

-----Original Message-----
From: Jose G Corona [mailto:jcorona@artisan.com]
Sent: Monday, August 18, 2003 11:38 AM
To: ibis-users
Subject: [IBIS-Users] Creating 3 sets of R/F Waveforms

Hello IBIS-users,

I am trying to generate ibis model for SSTL, this IO has termination
resistor of 50 Ohm connected to VDD/2. While looking into many other
ibis models from different providers, I have found that there are always
two termination voltages (0 and VDD or 0 and VDD/2). I want to create
an ibis model with three termination voltages "0, vdd/2 and vdd". But
the tool (North Carolina Univ's tool) only generates the waveforms for
the first two but not the third.
Is it possible for UNC s2ibis2 to create 3 sets of R/F waveforms?
 Also, I am not sure whether it is ibis-complaint to have three
termination voltage schemes?

In the s2i tech file , I have using following lines
-----------------------------------------------------
rising_waveform1 = [Rising waveform] 50 0 NA NA NA NA NA NA NA
falling_waveform1 = [Falling waveform] 50 0 NA NA NA NA NA NA NA
rising_waveform2 = [Rising waveform] 50 1.25 NA NA NA NA NA NA NA
falling_waveform2 = [Falling waveform] 50 1.25 NA NA NA NA NA NA NA

rising_waveform3 = [Rising waveform] 50 2.5 NA NA NA NA NA NA NA
falling_waveform3 = [Falling waveform] 50 2.5 NA NA NA NA NA NA NA
----------------------------------------------------------

Thanks for your precious time and I will really appreciate your response.

-Jose 

-- 
Jose G. Corona
Analog/Mixed-Signal Business Unit
ARTISAN COMPONENTS, INC.
Tel:    (858) 731-3428
Fax:    (858) 457-5578

www.artisan.com

"Artisan: The IP Partner of Choice"
 
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