RE: [IBIS-Users] Simulating IBIS at the maximum frequency

Hi Gowtham,
I am adding little more information to Scott.

Find some more information at IBIS forum discussion mail archive.
Details of the mail chain is
Subject:  [IBIS]  input signal for model usage.
DATE   :  Wed 3/18/2009 (around)

There are some discussion in IBIS quality group also.
I have attached a file containing the discussion in IBIS quality group
meetings.
This contain the different quality aspects to be taken care while
shrinking the VT window.
You can find the same file in the IBIS quality discussion archive at
	http://www.vhdl.org/pub/ibis/quality_wip/


with regards,
Muniswara Reddy . V
Design engineer, PIPD-IO group,
Bangalore.


-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Scott McMorrow
Sent: Monday, May 18, 2009 8:47 PM
To: g-m@ti.com
Cc: ibis-users@eda.org; ibis@eda.org
Subject: Re: [IBIS-Users] Simulating IBIS at the maximum frequency

Gowtham

Since time is relative in IBIS model simulations, what you do is to 
normalize the V/T table timing, by shifting the slower corner curves 
back towards zero.  Essentially, you remove any leading static values 
from the curves, prior to the edge transitions.

Scott


Gowtham M wrote:
> Hello,
>
> How do we ensure that IBIS model can be correctly simulated at the 
> highest possible frequency? Suppose, I have a buffer which is expected

> to work at 100MHz. Hence, the VT table should be at most 1 / ( 2 * 
> 100M ) = 5ns wide.
>
> If the buffer is designed such that it can just meet this requirement 
> in min (slow) corner. The problem that I am facing is that I cannot 
> represent all of typ/min/max transitions within this window of 5ns 
> because of variations in buffer delay across corners.
>
> How do I create an IBIS model that can be correctly simulated at 
> 100MHz in such cases?
>
> Thanks for your help.
>
> Gowtham
>

-- 
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

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Teraspeed Consulting Group LLC


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