RE: [IBIS-Users] pulse/step description for v/t curves

Hi Sujit,
Just FYI, you can specify Tr and Tf in the .s2i file as follows, 
[Tr]    typ        min     max
[Tf]    typ        min     max
- April

---------------------------------------------------
April Hachenburg
Core Technology Design Engineer
SMSC - Phoenix




"NG,MEI-YEE" <mei-yee.ng@avagotech.com> 
Sent by: owner-ibis-users@server.eda.org
12/21/2006 05:30 PM

To
"Sujit Kumar-r65837" <sujit@freescale.com>
cc
<ibis-users@server.eda.org>
Subject
RE: [IBIS-Users] pulse/step  description for v/t curves






Hi Sujit,
 
Again, from my limited experience, the [sim time] value chosen is based on 
the amount of time your pad needs to reach the stable value after 
transition. Basically, it should be longer than your rise or fall time. 
 
As for the pulse information, I simulated them based on the expected td, 
tr, etc that I would expect from my pad’s inputs/stimuli.
 
Hope it helps.
 
Best regards,
Mei Yee
SID, Avago Technologies (Malaysia)
Tel no.:604-6108515
 
 

From: Sujit Kumar-r65837 [mailto:sujit@freescale.com] 
Sent: Thursday, December 21, 2006 5:48 PM
To: Sujit Kumar-r65837
Cc: NG,MEI-YEE; ibis-users@eda.org
Subject: Re: [IBIS-Users] pulse/step description for v/t curves
 
hi IBIS users
any suggestions on this?
Its quite urgent for me.

Sujit Kumar-r65837 wrote:

hi Mei
From the ibis document what I understand is;  there is only one switch 
(i.e sim time) in .s2i file to describe
the pulse. Then following queries arise:

 -- on what basis should one choose this [sim time] value? 
       I need to know this because I have to generate ibis model for an IO 
pad.
 
 -- How are the following values calculated to describe the pulse i.e 
      td, tr, tf, width and period.

thanks 
sujit

NG,MEI-YEE wrote:

Hi Sujit,
 
From my limited experience with s2ibis3, I discovered that the pulse size 
was generated by dividing your sweep range by 100 points. If you need to 
make it finer, you might need to edit the .spi files manually, but keep in 
mind that the number of points allowed for version 3.2 is 100 only.
 
Thank you.
 
Best regards,
Mei Yee
SID, Avago Technologies (Malaysia)
Tel no.:604-6108515

From: owner-ibis-users@server.eda.org [
mailto:owner-ibis-users@server.eda.org] On Behalf Of Sujit Kumar-r65837
Sent: Thursday, December 21, 2006 1:23 PM
To: Sujit Kumar-r65837
Cc: ibis-users@server.eda.org
Subject: [IBIS-Users] pulse/step description for v/t curves
 
hi IBIS users
Can anyone help me for this?

Sujit Kumar-r65837 wrote:


How to specify the pulse/step  description in .s2i file for  generating 
v/t curves?
How do you reach upon those values?


-- 
thanks
sujit kumar




+91-120-4396069
+91-09910168788 

 
-- 
thanks
sujit kumar




+91-120-4396069
+91-09910168788 

 
 
-- 
thanks
sujit kumar




+91-120-4396069
+91-09910168788 

 
 
-- 
thanks
sujit kumar




+91-120-4396069
+91-09910168788 

 


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