RE: [IBIS-Users] IBIS non-monotonicity issue

Hi Vinayak,



        I have noticed below points from the data you pasted herewith



1)       what is the significance of generating POWER clamp table for
1.8 to 1.96 ? because this might captured in GND clamp range.

2)       if the data started from -1.8 (assuming buffer operating at
1.8V)  data is captured till 1.9818V (1.8 + 0.1818182) i.e actual POWER
clamp data is present for 1.9818V to 3.6V

        coming to data present between 1.8V to 1.963636V is actual Vpad
of  0V to 0.1636V .



usually  the voltage  value for IV data is as follows

Pu/Pd tables -------->  -1.8 to 3.6V

GND clamp tables ---------> -1.8 to 1.8V

POWER clamp tables   --------> 1.8V  to 3.6V



Coming to warning I think  data is -1.8 to -0.1818182 follows one
order(+vely increasing) after that

1.963636 to 1.8V follows other order (+vely decreasing)



Hope this helps you



Best Regards

Kiran Kumar





________________________________

From: owner-ibis-users@server.eda-stds.org
[mailto:owner-ibis-users@server.eda-stds.org] On Behalf Of Vinayak
Sent: Monday, August 07, 2006 2:03 PM
To: ibis@server.eda-stds.org
Cc: ibis-users@server.eda-stds.org
Subject: [IBIS-Users] IBIS non-monotonicity issue



Hi,

I was trying run ibischk4 on the ibis model
it gives a warning as

WARNING (line  165) - POWER Clamp Voltage data is non-monotonic

though i could not find any non-monotonicity in the values
in the ibis model.

   -0.2181818   0.1062643m    46.73129u   0.2034879m
         -0.2    0.106231m    46.71362u   0.2034473m
   -0.1818182   0.1061977m    46.69595u   0.2034067m
     1.963636    0.106169m    46.68056u   0.2033726m
     1.945455   0.1061409m    46.66543u   0.2033392m  ----> line 165
     1.927273   0.1061128m     46.6503u   0.2033058m
     1.909091    0.106087m    46.63619u   0.2032756m
     1.890909   0.1060628m    46.62276u   0.2032475m
     1.872727   0.1060386m    46.60933u   0.2032194m
     1.854545   0.1060153m    46.59625u   0.2031925m
     1.836364   0.1059939m    46.58398u   0.2031681m
     1.818182   0.1059725m    46.57171u   0.2031437m
          1.8   0.1059511m    46.55944u   0.2031194m

Should i ignore this warning.

Regards
vinayak




The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments.

WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email.

www.wipro.com
--------------------------------------------------------------------
|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