[IBIS-Users] possible ibis golden parser bug

Hi all:

    I am generating a IBIS model for an output buffer, and I have a STRANGE
problem. I have an output buffer with low drive/high drive options, they are
selected by activate an enable pin. I get all curves for output buffer low
drive option and check the syntax and construction with IBISCHK3 V3.2.9
and the model passes without errors or warnings. But when I active the high
drive option and again get all curves for the output buffer the IBISHK3
gives several errors and warnings. The only thing that I changed was the
enable voltage !!!
     What happen?
      It is possible that the parser IBISCHK3 V3.2.9 has a bug?
      Or my model is not correctly constructed? But if this the case, why
when I check the model for low drive the parser does not give errors o
warnings?

       Here the error list that I obtain from IBISCHK3:

WARNING - Model OUTPUT: POWER Clamp : Typical value never becomes zero
WARNING - Model OUTPUT: POWER Clamp : Minimum value never becomes zero
WARNING - Model OUTPUT: POWER Clamp : Maximum value never becomes zero
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture]=3.3V
     has TYP column DC endpoints of 0.73V and 3.30v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.22V and 1.45V),
     a difference of 41.16% and 150.48%, respectively.
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture]=0V
     has TYP column DC endpoints of 0.00V and 2.56v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.42V and 0.21V),
     a difference of 67.04% and 373.91%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture]=3.3V
     has TYP column DC endpoints of 0.73V and 3.30v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.22V and 1.45V),
     a difference of 41.16% and 150.48%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture]=0V
     has TYP column DC endpoints of 0.00V and 2.56v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.42V and 0.21V),
     a difference of 67.04% and 373.91%, respectively.
WARNING - Model 'OUTPUT': TYP VI curves cannot drive through Vmeas=1.65V
         given load Rref=50 Ohms to Vref=1.65V
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_min]=3V
     has MIN column DC endpoints of 0.77V and 3.00v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.31V and 1.40V),
     a difference of 42.23% and 147.88%, respectively.
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_min]=0V
     has MIN column DC endpoints of 0.00V and 2.17v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.35V and 0.09V),
     a difference of 80.17% and 474.98%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_min]=3V
     has MIN column DC endpoints of 0.77V and 3.00v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.31V and 1.40V),
     a difference of 42.27% and 147.88%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_min]=0V
     has MIN column DC endpoints of 0.00V and 2.17v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.35V and 0.09V),
     a difference of 80.17% and 475.12%, respectively.
WARNING - Model 'OUTPUT': MIN VI curves cannot drive through Vmeas=1.65V
         given load Rref=50 Ohms to Vref=1.65V
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_max]=3.6V
     has MAX column DC endpoints of 0.72V and 3.60v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.16V and 1.55V),
     a difference of 40.41% and 147.58%, respectively.
ERROR - Model OUTPUT: The [Rising Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_max]=0V
     has MAX column DC endpoints of 0.00V and 2.90v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.49V and 0.34V),
     a difference of 59.18% and 307.62%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_max]=3.6V
     has MAX column DC endpoints of 0.72V and 3.60v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages ( 0.16V and 1.55V),
     a difference of 40.41% and 147.58%, respectively.
ERROR - Model OUTPUT: The [Falling Waveform]
     with [R_fixture]=50 Ohms and [V_fixture_max]=0V
     has MAX column DC endpoints of 0.00V and 2.90v, but
     an equivalent load applied to the model's I-V tables yields
     different voltages (-0.49V and 0.34V),
     a difference of 59.18% and 307.62%, respectively.
WARNING - Model 'OUTPUT': MAX VI curves cannot drive through Vmeas=1.65V
         given load Rref=50 Ohms to Vref=1.65V
Errors : 12

Warnings : 6

File Failed

          Best regards,

          Ramiro R. Lecona

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Received on Wed Oct 27 12:02:16 2004