RE: [IBIS-Users] IO, output, Input buffers

From: Lance Wang <lwang_at_.....> Date: Sun May 21 2006 - 17:09:44 PDT · This archive was generated by hypermail 2.1.8 : Sun May 21 2006 - 17:10:35 PDT

Tom just gave another option to convert an IO to Output only IBIS
buffer. 

However, to be clear, if you want to have only Pullup/Pulldown in this
IBIS Output buffer model, I think you will have to do what I explained
in my previous email.

Lance Wang
Cadence Design Systems, Inc.

-----Original Message-----
From: Tom Dagostino [mailto:tom@teraspeed.com] 
Sent: Sunday, May 21, 2006 8:00 PM
To: Lance Wang; Abdulrahman Rafiq -X (arafiq - Digital-X, Inc. at
Cisco); mithlesh.shrivas@freescale.com; ibis-users
Subject: RE: [IBIS-Users] IO, output, Input buffers

No

The simulator will do that.  Leave the clamp curves alone for an output
buffer.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

-----Original Message-----
From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of Lance Wang
Sent: Sunday, May 21, 2006 8:14 AM
To: Abdulrahman Rafiq -X (arafiq - Digital-X, Inc. at Cisco);
mithlesh.shrivas@freescale.com; ibis-users
Subject: RE: [IBIS-Users] IO, output, Input buffers

Abdul,
IBIS Pullup/Pulldown curves don't include Clamps when Clamp data are
presented. So you will have to combine Clamps with Pullup/Pulldown for
output buffers.

Lance Wang
Cadence Design Systems, Inc.

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Abdulrahman Rafiq -X (arafiq - Digital-X, Inc. at Cisco)
Sent: Saturday, May 20, 2006 4:14 PM
To: mithlesh.shrivas@freescale.com; ibis-users
Subject: RE: [IBIS-Users] IO, output, Input buffers

 Mithlesh,

Yes, you are correct.

The I/O model_type will consist of the following V/I anf V/T tables

Pullup
Pulldown
Gnd clamp
Power clamp
Riseing waveforms
Falling waveforms

For output only model_type, remove the ground and power clamps.

For Input only model_type, remove the pullup, pulldown, rising and
falling waveforms.

Hope this helps. Feel free to ping me if you have any other questions.

Thanks,

Abdul Rahman Rafiq
Hardware/Signal Integrity Engineer
Cisco Systems, Inc. Central Engineering
ASIC's Signal Integrity & Packaging Design Group
Phone: (408) 527-5540
Email : arafiq@cisco.com

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Mithlesh Shrivas-r64034
Sent: Saturday, May 20, 2006 5:21 AM
To: ibis-users
Subject: [IBIS-Users] IO, output, Input buffers

Hello Experts,

I use [model selector] to select different models for pins. Few pins are
I/O, Output only and Input only.
The output only models do not have power/ground clamp curves and Input
only models have only clamp curves. i.e.
if i remove particular section, i can convert a IO model to output/Input
models, right?

Now, do i need to separately define Output & Input only models to
particular pins or I use the IO type model for them as well?

-----------------
[model selector]     io_type
IO models

[model selector]    output_type
Output models (or IO models ???)

[model selector]     Input_type
Input models (or IO models???)

-----------------

Highly appreciate your quick response.

Thank you!
Mithlesh

--
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Mithlesh Shrivas (Core-id:R64034).......
Design Engineer.........................
Freescale Semiconductor India Pvt. Ltd..
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Sector- 16A, Noida- 201301 U.P. (India).
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