Subject: [IBIS-Users] IBIS 4.0 cookbook (was IBIS website (Question, Internal 100 Ohms termination))
From: Lynne Green (lgreen@cadence.com)
Date: Thu May 01 2003 - 14:15:50 PDT
All-
Cookbook 4.0 topic list is under construction.
Anyone having topics they would like to see addressed, please drop me a
line. Even if it is a frequently-occurring topic (such as on-die
terminations) from the ibis reflector, it doesn't hurt to pass it along.
:-)
Best regards,
Lynne
Dr. Lynne Green
Senior Member of Consulting Staff
Cadence Design Systems, Inc.
"All the world's an analog stage, whereon digital plays bit parts."
Fred Field, Hughes Aircraft (1970's).
-----Original Message-----
From: Peter LaFlamme [mailto:plaflamm@amcc.com]
Sent: Thursday, May 01, 2003 12:45 PM
To: tom@teraspeed.com
Cc: 'Syed Huq'; ibis-users@eda.org; gblando@axiowave.com
Subject: Re: [IBIS-Users] IBIS website (Question, Internal 100 Ohms
termination)
Hi Tom,
Nice work putting the model into the parser. However, I think the real
problem is not the model syntax. It is " which software programs will
actually recognize this"? I have created models just like this and have
never found a program that would actually understand the syntax (or
actually use the model properly). I think that this method of modeling
the termination resistor is much better than that dynamic clamp mumbo
jumbo that you see in other models. I find models using that method are
usually pretty
hokey.
On that note... It would also be nice for the IBIS committee members
that actually read these messages to think about creating an IBIS
modeling cookbook for Version 3 and Version 4. I think that this is just
as important as the specification. Additionally, it would be nice to
hear which software vendors support which features within IBIS. It gets
kind of frustrating when everyone that has a problem always blames the
model.
Now I feel better...
Peter
Tom Dagostino wrote:
>
> I took the data Gustovo had put into a full IBIS model. I then passed
> it through the current checker and obtained no errors or warnings.
>
> Checking untitled.ibs for IBIS 3.2 Compatibility...
>
> Errors : 0
>
> File Passed
>
> I suspect you were using an old version of the parser that had a bug
> or the IBIS version in the model was not up to date to handle the
> features in this model.
>
> |*********************************************************************
> |**
> |
> [IBIS ver] 3.2
> [File name] untitled.ibs
> [File Rev] 1.0
> [Date] May 1, 2003
> [Source] Teraspeed Consulting Group LLC
> [Notes] Test model
> [Disclaimer] Absolutely no guarantees, for modeling purposes only
> |
>
|***********************************************************************
*
> | Component test
> |*********************************************************************
> |***
> |
> [Component] Untitled
> [Manufacturer] Test
> [Package]
> | variable typ min max
> R_pkg 18.60m 16.50m 21.20m
> L_pkg 5.17nH 4.58nH 5.89nH
> C_pkg 1.47pF 1.17pF 1.69pF
> |
> [Pin] signal_name model_name R_pin L_pin C_pin
> |
> 16 CLK1 Z630781_IN4 .174 3.79n .41p
> 17 _CLK1 Z630781_IN4 .171 3.6n .37p
> |
> [Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
> |
> 16 17 800mv NA NA NA
> |
>
> [Series Pin Mapping] pin_2 model_name
> 16 17 Series_100
> |
> [Model] Z630781_IN4
> Model_type Input_ECL
> Vinl = 1.657V
> Vinh = 2.277V
> C_comp 3.000pF NA NA
> |
> | variable typ min max
> [Voltage Range] 3.300V NA NA
> [GND Clamp Reference] 0.000V NA NA
> [POWER Clamp Reference] 3.300V NA NA
> |
> [GND Clamp]
> |
> -3.300V -513.0mA NA NA
> -1.054V -44.40mA NA NA
> -912.0mV -20.00mA NA NA
> -811.0mV -7.000mA NA NA
> -750.0mV -2.300mA NA NA
> -709.0mV -800.0uA NA NA
> -669.0mV -200.0uA NA NA
> -334.5mV 0.000A NA NA
> 1.449V 0.000A NA NA
> 6.600V 250.3uA NA NA
> |
> [POWER Clamp]
> |
> 6.600V 0.000A NA NA
> -326.7mV 0.000A NA NA
> -490.0mV 86.25uA NA NA
> -561.0mV 86.25uA NA NA
> -632.0mV 179.3uA NA NA
> -693.0mV 179.3uA NA NA
> -754.0mV 473.4uA NA NA
> -795.0mV 1.271mA NA NA
> -835.0mV 3.069mA NA NA
> -936.0mV 12.36mA NA NA
> -1.038V 26.06mA NA NA
> -3.300V 400.2mA NA NA
> |
>
> [Model] Series_100
> Model_type Series
> C_comp 0 0 0
> |
> [Voltage Range] 3.3 3.1 3.6
> [R series] 100 86 120
> [End]
>
> 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 Syed Huq
> Sent: Thursday, May 01, 2003 11:13 AM
> To: ibis-users@server.eda.org
> Subject: [IBIS-Users] IBIS website (Question, Internal 100 Ohms
> termination)
>
> ------------- Begin Forwarded Message -------------
>
> From: Gustavo Blando <gblando@axiowave.com>
> To: "'shuq@cisco.com'" <shuq@cisco.com>
> Subject: IBIS website (Question, Internal 100 Ohms termination)
> Date: Thu, 1 May 2003 14:05:36 -0400
> MIME-Version: 1.0
>
> I would like to ask a question for an IBIS specification. I am not
> sure if I am sending this email to the right place, if not please
> advise where it should be sent.
>
> Hello, if I have an internal 100 Ohms termination in my receiver
> between P and N. How is the appropriate way to model that in IBIS.
> Please advise off different alternatives.
>
> Thanks.
>
> This is what I tried, but it did not work, It says this
> ERROR - Component 'XXXX': [Series Pin Mapping] Pin2 '17': model type
> cannot be Series or Series_switch.
>
> [Pin] signal_name model_name R_pin L_pin C_pin
> |
> 16 CLK1 Z630781_IN4 .174 3.79n .41p
> 17 _CLK1 Z630781_IN4 .171 3.6n .37p
> |
> [Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
> |
> 16 17 800mv NA NA NA
> |
>
> [Series Pin Mapping] pin_2 model_name
> 16 17 Series_100
> |
> [Model] Z630781_IN4
> Model_type Input_ECL
> Vinl = 1.657V
> Vinh = 2.277V
> C_comp 3.000pF NA NA
> |
> | variable typ min max
> [Voltage Range] 3.300V NA NA
> [GND Clamp Reference] 0.000V NA NA
> [POWER Clamp Reference] 3.300V NA NA
> |
> [GND Clamp]
> |
> -3.300V -513.0mA NA NA
> -1.054V -44.40mA NA NA
> -912.0mV -20.00mA NA NA
> -811.0mV -7.000mA NA NA
> -750.0mV -2.300mA NA NA
> -709.0mV -800.0uA NA NA
> -669.0mV -200.0uA NA NA
> -334.5mV 0.000A NA NA
> 1.449V 0.000A NA NA
> 6.600V 250.3uA NA NA
> |
> [POWER Clamp]
> |
> 6.600V 0.000A NA NA
> -326.7mV 0.000A NA NA
> -490.0mV 86.25uA NA NA
> -561.0mV 86.25uA NA NA
> -632.0mV 179.3uA NA NA
> -693.0mV 179.3uA NA NA
> -754.0mV 473.4uA NA NA
> -795.0mV 1.271mA NA NA
> -835.0mV 3.069mA NA NA
> -936.0mV 12.36mA NA NA
> -1.038V 26.06mA NA NA
> -3.300V 400.2mA NA NA
> |
>
> [Model] Series_100
> Model_type Series
> C_comp 0 0 0
> |
> [Voltage Range] 3.3 3.1 3.6
> [R series] 100 86 120
>
> Gus
>
> Gustavo Blando
> Axiowave Networks
> Tel: (774) 348-4784
> Fax: (774) 348-4008
> email: gblando@axiowave.com
>
> ------------- End Forwarded Message -------------
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