Subject: RE: [IBIS-Users] (lv)pecl
From: erik.van.der.ven@philips.com
Date: Fri May 09 2003 - 00:40:58 PDT
Tom,
Thank you for your reply. I am starting with a Spectre netlist. I have
tried s2ibis to make a model for LVPECL.
I noticed some differences. ECL has a supply of 0V (plus) and -5.2V (neg).
My circuit has a supply of 3.3V (plus) and 0V (neg).
The pulldown table ranges from 1.1V to 3.3V (the pull down reference has
been set to 3.3V, the pull-up reference as well), followed by ten lines of
garbage. A collegue of mine has changed to pragram a bit so the pull down
curve starts at 0V and ends at 2.2V (still followed by ten lines of
garbage).
Is this a correct range?
What does the simulator that uses the IBIS model do with the information
that it is an output-ECL model type? And how are the data tables
interpreted in conjunction with the ECL_model type?
With kind regards,
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
"Tom Dagostino" <tom@teraspeed.com>
05/08/03 07:16 PM
Please respond to tom
To: Erik van der Ven/NYM/SC/PHILIPS@EMEA2
cc:
Subject: RE: [IBIS-Users] (lv)pecl
Classification:
Erik
What are you starting with? A SPICE description or are you going to make
the model from measurements? If you start with SPICE there is a spice to
ibis program that you can download from the ibis home page. If you are
starting from measurements then you will need a lot of equipment to make
the measurements. You will have to manually convert the measurements to
the ibis data.
Simulators use the output_ecl line to know how to handle ECL. In IBIS ECL
models are slightly different than standard CMOS or TTL drivers. In CMOS
or TTL the pulldown current is sunk into the ground plane and the pullup
current is sourced from the supply. With PECL both the pullup and
pulldown are sourced from the supply. So in PECL the pulldown is
referenced to the supply, not ground. The simulator needs to know this
when it is using the IV tables.
Tom Dagostino
Teraspeed Consulting Group LLC Teraspeed Consulting Group LLC
2926 SE Yamhill St. Device Modeling Division
Portland, OR 97214 13610 SW Harness Lane
Beaverton, OR 97008
http://www.teraspeed.com 503-430-1065
tom@teraspeed.com
-----Original Message-----
From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org]On Behalf Of erik.van.der.ven@philips.com
Sent: Thursday, May 08, 2003 12:04 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] (lv)pecl
Dear all,
I think I mailed my question too early since I subscribed to the user
group at the same time. So I'll post it again, please see below.
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
----- Forwarded by Erik van der Ven/NYM/SC/PHILIPS on 05/08/03 09:03 AM
-----
Erik van der Ven
05/06/03 02:01 PM
To: ibis-users@eda.org
cc:
Subject: (lv)pecl
Classification: Unclassified
1. How can I make an IBIS model of a (LV)PECL model?
2. What does an IBIS simulator do with the model type information (like
output_ECL)?
Can anyone help me?
Thanks.
With kind regards,
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
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