[IBIS] Warnings in GPIO pad ibis file with ibischk3

From: Mithlesh Shrivas <mithlesh.shrivas_at_xxxnowhere.com>
Date: Mon Feb 14 2005 - 20:56:47 PST
Hi Experts,
                    While checking the quality of .ibs file with 
ibischk3 , I'm encountering following warnings. The I/O pad is general 
purpose.




IBISCHK3 V3.2.9

Checking gpv1p8_1.ibs for IBIS 2.1 Compatibility...

WARNING -
    Model gpv1p_100kPUstd_s0h1: GND Clamp : Maximum value never becomes zero
WARNING -
    Model gpv1p_100kPUstd_s0h1: POWER Clamp : Minimum value never 
becomes zero

***Why above two warning are coming ?? I didnt face these warnings for 
DDR I/O pad.


WARNING - Model gpv1p_100kPUstd_s0h1: The [Rising Waveform]
      with [R_fixture]=50 Ohms and [V_fixture_min]=0V
      has MIN column DC endpoints of  0.00V and  0.21v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.02V and  0.23V),
      a difference of  7.63% and  9.39%, respectively.
WARNING - Model gpv1p_100kPUstd_s0h1: The [Rising Waveform]
      with [R_fixture]=500 Ohms and [V_fixture_min]=0V
      has MIN column DC endpoints of  0.00V and  1.25v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.04V and  1.26V),
      a difference of  3.48% and  1.29%, respectively.
WARNING - Model gpv1p_100kPUstd_s0h1: The [Falling Waveform]
      with [R_fixture]=500 Ohms and [V_fixture_min]=1.65V
      has MIN column DC endpoints of  0.38V and  1.65v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.44V and  1.65V),
      a difference of  5.00% and  0.03%, respectively.

***These warnings remain same even if I increase the simulation time 
from 15ns to 30ns. It means the waveforms are settled and wont see any 
significant
change with the simulation time. Could there be any other reason ?

WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in TYP 
GND_Clam
p VI Curve (-1092A @ -1.5V)
WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in MIN 
GND_Clam
p VI Curve (-1012.3A @ -1.5V)
WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in MAX 
GND_Clam
p VI Curve (-1174.7A @ -1.5V)
WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in TYP 
POWER_Cl
amp VI Curve (1370.6A @ -1.5V)
WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in MIN 
POWER_Cl
amp VI Curve (1249.7A @ -1.5V)
WARNING - Model 'gpv1p_100kPUstd_s0h1': Extreme currents present in MAX 
POWER_Cl
amp VI Curve (1493.4A @ -1.5V)

****Are these warning inevitable ??

Errors  : 0
Warnings: 11

File Passed

**** Is this a good model even if there are warnings since it has passed 
the check3?

Any suggestion/solution would be highly appreciable.

Thanks & regards,
Mithlesh




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Mithlesh Shrivas (Core-id:R64034).......
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Received on Mon Feb 14 20:57:09 2005

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