[IBIS-Users] RE: BOUNCE ibis-users@eda.org: Non-member submission from ["Ryohei Kato" <Ryohei.Kato@synopsys.com>]

Hello Michael,

Thank you for your reply and adding me to the mailing list!!!

Q1:
>So, I would not expect traditional IBIS results to change if you alter
the tool temperature setting.  If you use IBIS 4.1 or 4.2 with Verilog-A
or AMS code, and that code relies on temperature, you should see some
effect, however.

Do you have a sample of IBIS 4.1 or 4.2 with Verilog-A or AMS code which
has temperature characteristic?
If yes, could you send me it?
If no, can I get it from the semiconductor vender?
(Most IBIS models on Web are IBIS 2.* or 3.*. )

I would like to confirm the temperature characteristic of I/O buffer by
simulation.


Q2:
I understood your answer.


Q3:
I have another question.
In IBIS FAQ, IBIS model can perform the SSO analysis.

http://www.eigroup.org/ibis/faq.htm#a6

I think that it is difficult to express the current of power node in
IBIS model.
Ex; I(power_clump), I(ground_clump)

Can IBIS model express it?

If yes,
Which version of IBIS model can I do it?
Which keyword of IBIS model is necessary?
Is there a sample material of SSO analysis?


Regards,
Ryohei Kato



-----Original Message-----
From: Mirmak, Michael [mailto:michael.mirmak@intel.com] 
Sent: Saturday, October 07, 2006 2:38 AM
To: ryohei.kato@synopsys.COM
Subject: RE: BOUNCE ibis-users@eda.org: Non-member submission from
["Ryohei Kato" <Ryohei.Kato@synopsys.com>] 

Kato san,

Thank you for your interest in IBIS!  As you are not a subscriber to the
mailing list, the reflector did not receive your message.  We will add
you to the list shortly.

To answer your questions:

1) Traditional IBIS (meaning, IBIS that uses table data instead of AMS)
is a "snapshot" of the behavior of a buffer under the named conditions.
In other words, the voltage and temperature parameters describe what the
part's state was when the I-V, V-t and C_comp data was extracted.  No
relationship is specified between the tables and the temperature or
voltage; if the tool using the IBIS data does not interpolate a
relationship, then changing simulation temperatures will not change the
buffer's behavior.

So, I would not expect traditional IBIS results to change if you alter
the tool temperature setting.  If you use IBIS 4.1 or 4.2 with Verilog-A
or AMS code, and that code relies on temperature, you should see some
effect, however.

2) This is determined by the tool; the IBIS model/file does not control
the usage of the data.  In the case of Synopsys HSPICE (which I assume
you are using, from your e-mail address!), the "typ=xxx" line under the
B-element would affect the buffer corner and therefore which tables are
used.

I hope this helps!  Please consult the IBIS Cookbook for further
details: http://www.eda-stds.org/ibis/cookbook/cookbook-v4.pdf

- Michael Mirmak
  Intel Corp.
  Chair, EIA IBIS Open Forum

-----Original Message-----

Hello experts,

I'm Ryohei Kato.
I have a question about the IBIS model. 

Q1:
Does the IBIS model have a temperature characteristic?
When I analyze the IBIS model using HSPICE, I set the temperature sweep.

(".temp 0 50 100")
But all the simulation results became the same. 

If the IBIS model doesn't have it, for what is the property of
"Temperature Range" used? 

Q2:
The property of "PULLdown", "PULLup", etc... have the typical, max, and
min column.
How can I switch these in simulation?

Please tell me the solution.


Regards,
Ryohei Kato

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