RE: [IBIS-Users] Modeling Differential I/O

Subject: RE: [IBIS-Users] Modeling Differential I/O
From: Kar Hooi Kuan (KHKUAN@altera.com)
Date: Wed Jul 31 2002 - 17:01:03 PDT

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Adam,

It is fine, you don't need to say sorry. Since we will experiencing creating
the other models. Maybe next time we can share our experience.

Thanks for your reply.

Regards,
________________________________
Kar Hooi Kuan
Applications Engineer
Altera Corporation Penang
Plot 6, Bayan Lepas Technoplex, Medan Bayan Lepas
11900 Penang, Malaysia
Tel(hp): 6012-5611508
(O) : 604-6366471
(Fax): 604-642-8525

-----Original Message-----
From: Adam.Tambone@fairchildsemi.com
[mailto:Adam.Tambone@fairchildsemi.com]
Sent: Wednesday, July 31, 2002 9:08 PM
To: Kar Hooi Kuan
Cc: ibis-users@eda.org
Subject: RE: [IBIS-Users] Modeling Differential I/O

Hello Kar,

I'll be honest... I just don't know. Perhaps there are others who can
shed some light on creating lvpecl and pcml IBIS models. Soon I will be
creating such models, but it will be a first for me and I don't have the
experience to share right now. Sorry I can't be more helpful.

Rgds,
Adam

|---------+--------------------------->
| | Kar Hooi Kuan |
| | <KHKUAN@altera.c|
| | om> |
| | |
| | 07/31/02 04:48 |
| | AM |
| | |
|---------+--------------------------->

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  | To: Adam Tambone/SouthPortland/Fairchild@Fairchild
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  | cc: ibis-users@eda.org
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  | Subject: RE: [IBIS-Users] Modeling Differential I/O
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Adam,

I see your method, I think that is a more accurate method. However, that is
for LVDS, is that applicable for other differential I/O like lvpecl or
pcml?
I found that there is no voltage offset for these two differential models.
Can we set a constant reference voltage accross the non-inverted and
inverted pins instead of using the offset voltage. Thanks.

Regards,
________________________________
Kar Hooi

-----Original Message-----
From: Adam.Tambone@fairchildsemi.com
[mailto:Adam.Tambone@fairchildsemi.com]
Sent: Wednesday, July 31, 2002 1:13 AM
To: 'Kar Hooi Kuan'; ibis-users@eda.org
Subject: RE: [IBIS-Users] Modeling Differential I/O

Hello Kar,

I hope this attachment makes it through...

Attached is a URL to a paper I wrote, and attached is a .ppt presentation
describing my experiences and methods of creating LVDS IBIS models ( check
the speaker notes in the presentation for descriptions of the slides ). If
the attachments do not make it through to the IBIS users list, and there is
anyone who wishes to have copies, just contact me offline.

The methods described have worked well for me, and for the most part the
feedback I have received has said that the methods have been working for
others. Although recently two people have contacted me about correlation
difficulties they are having. All feedback is welcome.

Rgds,
Adam

http://www.planetanalog.com/features/OEG20020403S0018

(See attached file: present2_bkup.ppt)

>
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  | To: "'Kar Hooi Kuan'" <KHKUAN@altera.com>,
ibis-users@eda.org |
  | cc:
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  | Subject: RE: [IBIS-Users] Modeling Differential I/O
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>
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Hello Kar:

The current cookbook does not contain information on creating
differential
models in IBIS. However, there have been several IBIS summit presentations
on the subject. The following link is for a paper presented at the January
2001 IBIS summit.

http://www.eda.org/pub/ibis/summits/jan01/

Download the file hegazy.zip. It's a long paper, but it should get you
started. In addition, I believe Adam Tambone from Fairchild has published
a
paper on LVDS modeling in IBIS -- it's available on the web, although I
don't have the URL handy at the moment.

Good Luck.

  Regards,
  Stephen Peters
  Intel Corp.

-----Original Message-----
From: Kar Hooi Kuan [mailto:KHKUAN@altera.com]
Sent: Monday, July 29, 2002 7:38 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] Modeling Differential I/O

Hi all,

I have problems modeling differential I/O model like PCML and LVDS. Is that
the method described in the IBIS cookbook can be used? If the cookbook
method cannot be used, how I can generate the IBIS model for differential
I/O?

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