RE: [IBIS-Users] dV/dT = 0.0000/0.00000

Hello, Vivek,

Please take a look at your "v-t" spice output file(s). It sounds like
either spice did not converge, or that simulation did not run long enough to
capture the full transient.

The AC mismatch errors are probably a result of this problem.

- Lynne

"IBIS training when you need it, where you need it."

Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Vivek Kumar Sundriyal
Sent: Wednesday, October 06, 2004 6:32 AM
To: ibis-users@eda.org
Cc: owner-ibis-users@eda.org
Subject: Re: [IBIS-Users] dV/dT = 0.0000/0.00000

Hi,

 I am new user of IBIS and am trying to generate the IBIS Model for one of
our
I/O pads.

 I get the following error on trying ibischk4 on the generated IBIS Model.
The
IBIS Model is generated using the s2ibis2.

ERROR (line 320) - dV must be greater than 0 in a Ramp specification
ERROR (line 320) - dT must be greater than 0 in a Ramp specification
ERROR (line 320) - dV must be greater than 0 in a Ramp specification
ERROR (line 320) - dT must be greater than 0 in a Ramp specification
ERROR (line 320) - dV must be greater than 0 in a Ramp specification
ERROR (line 320) - dT must be greater than 0 in a Ramp specification
ERROR (line 321) - dV must be greater than 0 in a Ramp specification
ERROR (line 321) - dT must be greater than 0 in a Ramp specification
ERROR (line 321) - dV must be greater than 0 in a Ramp specification
ERROR (line 321) - dT must be greater than 0 in a Ramp specification
ERROR (line 321) - dV must be greater than 0 in a Ramp specification

ERROR - Model ABCXYZ: The [Rising Waveform]
      with [R_fixture]=50 Ohms and [V_fixture]=0V
      has TYP column DC endpoints of 0.00V and 0.00v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages (-0.00V and -0.00V),
      a difference of 863.34% and 963.34%, respectively.
ERROR - Model ABCXYZ: The [Rising Waveform]
      with [R_fixture]=50 Ohms and [V_fixture]=3.3V
      has TYP column DC endpoints of 3.30V and 3.30v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 3.30V and 3.30V),

can anyone let me know the cause of this error ?

and i get dV/dT = 0.0000/0.00000 which is wrong ?

what can be the cause of the error ?

Any help is appreciated.

Thx,
Vivek

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Received on Wed Oct 6 08:51:54 2004