[IBIS-Users] regarding the rising n falling waveform again

Dear Tom,

 

Is me agian, the guy who asking the rising/falling waveform.

 

This time, I facing another problem, and wish to have your opinion. The recent model that I build, where having pullup problem. The problem is no mather how I change the IN and EN of my IO pins, I cant get the dv/dt_r in positive value although I set my model as I/O_OPEN_SINK.

 

For the falling waveform, although is look fine but also fail for the checker for 0v references.

 

The rising waveform is not working for 0v references and vcc references. The data is state at some value, it do change in a small scale but not showing a rising.

 

Is my model got problem or the circuit itself got problem? or there were other problems?

 

Below were my setting :

[Model] IO0
[Model type] I/O_open_sink
[Power clamp reference] 3.00 2.70 3.60
[Gnd clamp reference]   0   0   0
[Pullup reference]      3.00 2.70 3.60
[Pulldown reference]    0   0   0
[Rising waveform] 500 0 0 0 NA NA NA NA NA
[Rising waveform] 500 3.00 2.70 3.60 NA NA NA NA NA
[Falling waveform] 500 0 0 0 NA NA NA NA NA
[Falling waveform] 500 3.00 2.70 3.60 NA NA NA NA NA
[Vinl] 0.8
[Vinh] 2.10
[Cref] 30pF
[Vmeas] 1.50
[Rload] 50
[Model file] hsp.mod hspmin.mod hspmax.mod

Here, my ramp data :

[Ramp]
| variable       typ                 min                 max
dV/dt_r          -0.6000m/-0.2000n  -1.2000m/0.4000n  -0.6000m/-0.2000n
dV/dt_f          0.7236/2.6060n      0.4002/4.0761n      1.3476/1.4710n

 

ANd here the error message of my Falling waveform :

 

ERROR - Model IO0: The [Falling Waveform]
      with [R_fixture]=500 Ohms and [V_fixture_max]=0V
      has MAX column DC endpoints of  0.00V and  3.40v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.00V and  0.00V),
      a difference of 100.00% and 178015.78%, respectively.

 

 

Thanks

 

rdgs

yylau