RE: [IBIS-Users] ibschk- warnings

From: Muranyi, Arpad <arpad.muranyi_at_.....>
Date: Thu Jan 25 2007 - 08:19:55 PST
Sujit,
 
Please search the archives.  I am sure you will 
find some answers, as I have explained this about
a zillion of times on these email forums.
 
Another alternative is to get help from the
free IBIS model review committee.
 
http://www.eigroup.org/ibis/support.htm
mailto:lgreen22@mindspring.com
 
Arpad
=================================================

________________________________

From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Sujit Kumar-r65837
Sent: Thursday, January 25, 2007 5:58 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] ibschk- warnings


hi ibis experts
ibschk run on an ibis generates following warnings:

IBISCHK4 V4.0.2

Checking ddr.ibs for IBIS 4.0 Compatibility...

WARNING (line  219) - GND Clamp Typical data is non-monotonic
WARNING (line  219) - GND Clamp Minimum data is non-monotonic
WARNING (line  219) - GND Clamp Maximum data is non-monotonic
WARNING - Model io_pu0_pk1_ddr0_lo: The [Rising Waveform] 
      with [R_fixture]=50 Ohms and [V_fixture]=0V
      has TYP column DC endpoints of  0.00V and  0.18v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.01V and  0.18V),
      a difference of  4.10% and  3.91%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Falling Waveform] 
      with [R_fixture]=500 Ohms and [V_fixture]=1.8V
      has TYP column DC endpoints of  0.47V and  1.80v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.50V and  1.80V),
      a difference of  2.18% and  0.00%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Rising Waveform] 
      with [R_fixture]=500 Ohms and [V_fixture_min]=0V
      has MIN column DC endpoints of  0.00V and  0.96v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.02V and  0.96V),
      a difference of  2.14% and  0.59%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Rising Waveform] 
      with [R_fixture]=50 Ohms and [V_fixture_min]=0V
      has MIN column DC endpoints of  0.00V and  0.12v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.01V and  0.13V),
      a difference of  4.58% and  4.47%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Falling Waveform] 
      with [R_fixture]=500 Ohms and [V_fixture_min]=1.65V
      has MIN column DC endpoints of  0.64V and  1.65v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.67V and  1.65V),
      a difference of  2.83% and  0.00%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Rising Waveform] 
      with [R_fixture]=50 Ohms and [V_fixture_max]=0V
      has MAX column DC endpoints of  0.00V and  0.24v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.01V and  0.25V),
      a difference of  3.89% and  3.60%, respectively.
WARNING - Model io_pu0_pk1_ddr0_lo: The [Falling Waveform] 
      with [R_fixture]=500 Ohms and [V_fixture_max]=1.95V
      has MAX column DC endpoints of  0.39V and  1.95v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.42V and  1.95V),
      a difference of  2.06% and  0.01%, respectively.

Errors  : 0
Warnings: 10

File Passed

i have following queries:
>  what could be the possible reason for such warnings ? 
>  as  file is passing throgh ibschk, so can i neglect the above warnings ?

pls suggest.
.s2i and ibs file are attached for reference.



-- 

thanks
sujit kumar




+91-120-4396069
+91-09910168788 

<mailto:sujit@freescale.com> 


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Received on Thu Jan 25 08:21:33 2007

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