[SI-LIST] Re: IBIS Model error

  • From: Ralf Bruening <ralf.bruening@xxxxxxxx>
  • To: "Suresh.K" <sureshk@xxxxxxxxxxxxxx>
  • Date: Mon, 17 Nov 2003 15:43:47 +0100

Dear Suresh K.,
this problem happens quite often on IBIS files wich are
automatically generated - independed from the simulator you
are using beacuse these messages are caused from the
"official" IBIS Golden Parser (which is part of many EDA
applications reading IBIS).

It states that the IBIS file has problems in the content
as IBIS demands in the spec that the the DC end points
(calculated from the I-V tables must match the V-T end points (logic
levels) with some variance. If the variance/error is within 2% you
will just get a warning, otherwise  an error, in your models
the   difference is seriously  big.

You can either correct your model by hand - but even as well
it might be worth to contact IDT regarding the quality of
this IBIS file.

Feel free to contact me offline on further details how the
file is read/processed in Hot-Stage.

Kind regards

     Ralf Bruening
------------------------------------------------------------- 
Ralf Bruening - Product Manager - ZUKEN EMC Technology Center
High Speed Solution Business - Vattmannstr.3 -33100 Paderborn
Phone: +49 5251 150 600 (direct: 621) - FAX: +49 5251 150 700
Mobile: +49 170 4228512 - Alternative Mobile: +49 172 9070675
Email: ralf.bruening@xxxxxxxx   -   WWW: http://www.zuken.com
-------------------------------------------------------------


Monday, November 17, 2003, 10:37:21 AM, you wrote:

SK> Hi Gurus,

SK> Warm Wishes to all ......

SK> I'm a beginner for SI Analysis and I need some clarification
SK> about the Error of IBIS Model(71V2546-SRAM),which I'm getting when I
SK> Import it into the Zuken's Hotstage tool Constraint Manager-Simulation
SK> Library.

SK> Actully I'm using the model ,which I downloaded from IDT website.

SK> Please look into the error message below and give your precious
SK> suggestions,

SK> ERROR- Model IOPAD2546Z: The [Rising Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture]=1.5V
SK> has TYP column DC endpoints of  0.50V and  2.21v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.13V and  2.69V),
SK> a difference of 288.80% and 84.70%, respectively.
SK> ERROR- Model IOPAD2546Z: The [Falling Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture]=1.5V
SK> has TYP column DC endpoints of  0.50V and  2.21v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.13V and  2.69V),
SK> a difference of 288.98% and 84.70%, respectively.
SK> WARNING- Model 'IOPAD2546Z': TYP VI curves cannot drive through
SK> Vmeas=1.25V
SK>           given load Rref=50 Ohms to Vref=1.5V
SK> ERROR- Model IOPAD2546Z: The [Rising Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture_min]=1.5V
SK> has MIN column DC endpoints of  0.53V and  2.11v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.04V and  2.54V),
SK> a difference of 304.74% and 86.47%, respectively.
SK> ERROR- Model IOPAD2546Z: The [Falling Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture_min]=1.5V
SK> has MIN column DC endpoints of  0.53V and  2.11v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.04V and  2.54V),
SK> a difference of 304.74% and 86.47%, respectively.
SK> WARNING- Model 'IOPAD2546Z': MIN VI curves cannot drive through
SK> Vmeas=1.25V
SK>           given load Rref=50 Ohms to Vref=1.5V
SK> ERROR- Model IOPAD2546Z: The [Rising Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture_max]=1.5V
SK> has MAX column DC endpoints of  0.48V and  2.32v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.22V and  2.83V),
SK> a difference of 283.59% and 82.91%, respectively.
SK> ERROR- Model IOPAD2546Z: The [Falling Waveform] 
SK> with [R_fixture]=50 Ohms and [V_fixture_max]=1.5V
SK> has MAX column DC endpoints of  0.48V and  2.32v, but
SK> an equivalent load applied to the model's I-V tables yields
SK> different voltages ( 2.22V and  2.83V),
SK> a difference of 283.59% and 82.74%, respectively.
SK> WARNING- Model 'IOPAD2546Z': MAX VI curves cannot drive through
SK> Vmeas=1.25V
SK>           given load Rref=50 Ohms to Vref=1.5V
SK> Errors  : 6
SK> Warnings: 6

SK> File Failed

SK> Thanks & Regards,
SK> Suresh.K,
SK> Vth EDA Lab,
SK> C-DOT,
SK> Bangalore-52.

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