RE: [IBIS-Users] re: Warning message for IO_open_drain model

Hello, Timmy,
 
The warning says if you hook the circuit up (in simulation), it will only
switch a few millivolts, not enough for the output to cross Vmeas.  You
might try setting Rref and Vref to the normal load for this buffer.  (Rref
of 50 ohms for the transmission line load, in parallel with the pullup
load.)
 
One could also look at the V-t curves, to see where their endpoint voltages
are.
 
If you would like your model reviewed, the IBIS Model Review Committee
welcomes models that pass the IBIS parser.
 
Best regards,
Lynne
 
 
"IBIS training when you need it, where you need it."
 
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com


  _____  

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Ibis Model
Sent: Wednesday, October 24, 2007 11:04 PM
To: Server EDA
Subject: [IBIS-Users] re: Warning message for IO_open_drain model


Hi everyone,
 
I get a warning message "TYP VI curves cannot drive through Vmeas given load
Rref=1e+006 Ohms to Vref=0V" for IO_open_drain model. 
 
What does this message mean ? 
 
Regards,
Timmy

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
-- 
This message has been scanned for viruses and 
dangerous content by  <http://www.mailscanner.info/> MailScanner, and is 
believed to be clean. 


-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.




--------------------------------------------------------------------
|For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org
|with the appropriate command message(s) in the body:
|
|  help
|  subscribe   ibis       <optional e-mail address, if different>
|  subscribe   ibis-users <optional e-mail address, if different>
|  unsubscribe ibis       <optional e-mail address, if different>
|  unsubscribe ibis-users <optional e-mail address, if different>
|
|or e-mail a request to ibis-request@eda-stds.org.
|
|IBIS reflector archives exist under:
|
|  http://www.eda-stds.org/pub/ibis/email_archive/ Recent
|  http://www.eda-stds.org/pub/ibis/users_archive/ Recent
|  http://www.eda-stds.org/pub/ibis/email/         E-mail since 1993