[SI-LIST] Re: IBIS Model error
- From: "Feng F. Zhang" <feng.f.zhang@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx, si-list-bounce@xxxxxxxxxxxxx
- Date: Tue, 18 Nov 2003 08:17:15 +0800
Hi, Suresh,
You are lucky, guy. I know what happens.
This error is indeed a model error. The model provider is responsible to
correct it.
The starting and ending point of the rising/falling waveforms are steady
state values. They should be consistant to the data under keywords of
[Pullup/down] and [Ground/Power Clamp].
You should check the IBIS spec to know the method of how to get these V/I
data (under the keywords just mentioned). Then use them, do some
calculation mannuly, you can find the error. Remember, the calculation is
on steady state.
Thanks!
Jason Zhang
Signal Integrity Engineer
Simulation Center
Longhua Design Center
Foxconn
Tel: +86-755-28129588 ext.21772
Fax: +86-755-28129966 ext. 21939
Mobile: +86-13662662166
e-mail: feng.f.zhang@xxxxxxxxxxx
At 02:37 PM 11/17/2003 +0500, Suresh.K wrote:
>Hi Gurus,
>
>Warm Wishes to all ......
>
>I'm a beginner for SI Analysis and I need some clarification
>about the Error of IBIS Model(71V2546-SRAM),which I'm getting when I
>Import it into the Zuken's Hotstage tool Constraint Manager-Simulation
>Library.
>
>Actully I'm using the model ,which I downloaded from IDT website.
>
>Please look into the error message below and give your precious
>suggestions,
>
>ERROR- Model IOPAD2546Z: The [Rising Waveform]
>with [R_fixture]=50 Ohms and [V_fixture]=1.5V
>has TYP column DC endpoints of 0.50V and 2.21v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.13V and 2.69V),
>a difference of 288.80% and 84.70%, respectively.
>ERROR- Model IOPAD2546Z: The [Falling Waveform]
>with [R_fixture]=50 Ohms and [V_fixture]=1.5V
>has TYP column DC endpoints of 0.50V and 2.21v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.13V and 2.69V),
>a difference of 288.98% and 84.70%, respectively.
>WARNING- Model 'IOPAD2546Z': TYP VI curves cannot drive through
>Vmeas=1.25V
> given load Rref=50 Ohms to Vref=1.5V
>ERROR- Model IOPAD2546Z: The [Rising Waveform]
>with [R_fixture]=50 Ohms and [V_fixture_min]=1.5V
>has MIN column DC endpoints of 0.53V and 2.11v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.04V and 2.54V),
>a difference of 304.74% and 86.47%, respectively.
>ERROR- Model IOPAD2546Z: The [Falling Waveform]
>with [R_fixture]=50 Ohms and [V_fixture_min]=1.5V
>has MIN column DC endpoints of 0.53V and 2.11v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.04V and 2.54V),
>a difference of 304.74% and 86.47%, respectively.
>WARNING- Model 'IOPAD2546Z': MIN VI curves cannot drive through
>Vmeas=1.25V
> given load Rref=50 Ohms to Vref=1.5V
>ERROR- Model IOPAD2546Z: The [Rising Waveform]
>with [R_fixture]=50 Ohms and [V_fixture_max]=1.5V
>has MAX column DC endpoints of 0.48V and 2.32v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.22V and 2.83V),
>a difference of 283.59% and 82.91%, respectively.
>ERROR- Model IOPAD2546Z: The [Falling Waveform]
>with [R_fixture]=50 Ohms and [V_fixture_max]=1.5V
>has MAX column DC endpoints of 0.48V and 2.32v, but
>an equivalent load applied to the model's I-V tables yields
>different voltages ( 2.22V and 2.83V),
>a difference of 283.59% and 82.74%, respectively.
>WARNING- Model 'IOPAD2546Z': MAX VI curves cannot drive through
>Vmeas=1.25V
> given load Rref=50 Ohms to Vref=1.5V
>Errors : 6
>Warnings: 6
>
>File Failed
>
>Thanks & Regards,
>Suresh.K,
>Vth EDA Lab,
>C-DOT,
>Bangalore-52.
>
http://www.qsl.net/wb6tpu
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