RE: [IBIS-Users] RE: [IBIS] Warning in LVDS Clamp data

Plot the clamp curves and then ask yourself if this data is reasonable.
0.3+ Amps of current in an input structure?  In the active region?
 
 

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 Sudarshan Honnudike
Sent: Wednesday, March 14, 2007 7:07 AM
To: Mandel, Cary
Cc: ibis@server.eda.org; ibis-users@server.eda.org; Sudarshan Honnudike
Subject: [IBIS-Users] RE: [IBIS] Warning in LVDS Clamp data



Hi Cary, 

Thanks for the inputs. Indeed the cell has on - die termination. I will come
back to you if i have any questions. 

Thanks! 

Best Regards,

Sudarshan HN
NXP Semiconductors/CTO /PLT
C-4, Manyata Tech Park, Nagawara
Bangalore-560 045 , India.    
Ph:+91-80-40267073  
Fax: +91-80-4026 7855
seri:sudarsha@inpsblr
E-mail: sudarshan.honnudike@nxp.com 








"Mandel, Cary" <cary_mandel@mentor.com> 


Sent by: 
owner-ibis@server.eda.org 


2007-03-14 05:05 PM 


To
"Sudarshan Honnudike" <sudarshan.honnudike@nxp.com>
<ibis@server.eda.org>
<ibis-users@server.eda.org> 

cc

Subject
RE: [IBIS] Warning in LVDS Clamp data 

Classification

	




Hello Sudarshan, 
  
The 3rd warning means that, a clamp is allowing as much as 1/3 amp of
current to flow, while the voltage is still within the voltage rails. This
is probably not what you intended, unless, you are incorporating the
electrical charactersitics of an on-die-terminator into the clamps. 
  
If you would like to discuss this further, I suggest you contact Mentor
directly - you can email me if you like. 
  
Cary Mandel 
Mentor Graphics 
  


  _____  

From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf
Of Sudarshan Honnudike
Sent: 14 March 2007 11:11
To: ibis@server.eda.org; ibis-users@server.eda.org
Subject: [IBIS] Warning in LVDS Clamp data


Hi IBIS Experts, 

One of my customer is getting the following warning in ICX parser. 

;;    ;;   Warning: Current (0.306459) of summed typical power and ground
clamp curves exceed 0.005 amps in the range between power and ground.
;;    ;;   Warning: Current (0.274468) of summed minimum power and ground
clamp curves exceed 0.005 amps in the range between power and ground.
;;    ;;   Warning: Current (0.336667) of summed maximum power and ground
clamp curves exceed 0.005 amps in the range between power and ground.

While running ibischk4 I didnt get this warning. These warnings i am getting
for LVDS input cell. 

Please also let me know what this warning means. 


Best Regards,

Sudarshan HN
NXP Semiconductors/CTO /PLT
C-4, Manyata Tech Park, Nagawara
Bangalore-560 045 , India.    
Ph:+91-80-40267073  
Fax: +91-80-4026 7855
seri:sudarsha@inpsblr
E-mail: sudarshan.honnudike@nxp.com
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