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

Hello, Sehshari and Vinayak,
 
It is strongly recommended that all four I-V tables cover -Vcc to +2Vcc.
Currents are normally 0A above 0V for both POWER and GND clamp tables,
unless there is an on-die pullup/pulldown termination.  This is because IBIS
does not specify how tables are extrapolated when there is no data beyond
0V.
 
Model makers are welcome to submit models to the IBIS Model Review Committee
for review.  Further information is at
http://www.eigroup.org/ibis/support.htm.
 
Best regards,
Lynne
 
Lynne Green, Chair, IBIS Model Review Committee
 
 


  _____  

From: owner-ibis-users@eda-stds.org [mailto:owner-ibis-users@eda-stds.org]
On Behalf Of seshadri.kirankumar@wipro.com
Sent: Monday, August 07, 2006 2:57 AM
To: vinayak@ti.com; ibis@eda-stds.org
Cc: ibis-users@eda-stds.org
Subject: 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


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