Re: [IBIS-Users] How to obtain Golden waveforms of ver 4.x?

From: Siva Nageswara Rao Borra <siva_at_.....>
Date: Fri Sep 15 2006 - 05:02:06 PDT
Hi Michael,

"These are waveforms generated using the
original circuit design on which the IBIS data is based. "
 >> Is this mean that the Spice netlist from which the IBIS models
are drived?

Is it possible to obtain the golden waveforms from a spice netlist by 
simply,
simulating the output VT curves using the ideal test load specified by 
[test load] and
[test data] network?

In other words simply replacing the network of v_fixture, r_fixture, and 
c_fixture
(which is used for rising and falling waveforms?) with [test load] network?

Clarification will be of great help.

Regards,
Siva Borra.





Siva Nageswara Rao Borra wrote:

> Michael,
> The rising and falling waveforms are drawn considering the parameters, 
> L_dut, R_dut, C_dut,
> when applied the load with L_fixture, R_fixture, C_fixture.
> Where as the Golden waveforms are obtained at two different points 
> with [test load] and [test data]
> conditions are applied.
> My doubt is how will we get the [test load]/[test data] parameters?
> Are there any default values for these?
> Can you tell me how can we obtain the golden waveforms from spectre
> for the buffer example shown in open source s2ibis3
> download from http://www.ece.ncsu.edu/erl/ibis/s2ibis3/s2ibis3.htm?
> s2ibis3/example/ex1/buffer.ibs.
>
> Regards,
> Siva Borra.
>
>
> Mirmak, Michael wrote:
>
>> Siva,
>>
>> The "golden waveforms" are mentioned in the context of the [Test Data]
>> and [Test Load] keywords. These are waveforms generated using the
>> original circuit design on which the IBIS data is based. [Test Data]
>> can be included in an IBIS file to give recipients an idea of how well
>> the IBIS data, particularly after interpretation by an EDA SI tool,
>> matches the original circuit design's output for a given load condition.
>>
>>
>> For example, one could verify both the usage of the [Driver Schedule]
>> keyword in a particular tool and the data behind it by comparing it to
>> [Test Data] generated for the same test load and environmental
>> conditions. If the [Test Data] and tool output match, then the tool is
>> implementing the proper combination of the [Driver Schedule] sections
>> for that buffer design, test conditions and data pattern.
>>
>> - Michael Mirmak
>> Intel Corp.
>> Chair, EIA IBIS Open Forum
>>
>>
>> -----Original Message-----
>> From: owner-ibis-users@server.eda.org
>> [mailto:owner-ibis-users@server.eda.org] On Behalf Of Siva Nageswara Rao
>> Borra
>> Sent: Tuesday, September 05, 2006 00:18
>> To: ibis-users@server.eda.org
>> Cc: Siva Nageswara Rao Borra; deepti@india.nsc.com
>> Subject: [IBIS-Users] How to obtain Golden waveforms of ver 4.x?
>>
>> Hi Expert,
>> I need help regarding how to obtain the Golden waveforms mentioned in 
>> the
>> IBIS version 4.x ? And where they are useful?
>> Thanks in Advance for your help.
>> With best regards,
>> Siva Borra.
>>
>>
>>
>>
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Received on Fri Sep 15 04:58:59 2006

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