Re: using IBIS in HSPICE

Hi! Adam:

Thanks a lot for your help. I did use ramp_fwf option in the beginning when I
use IBIS in HSPICE but I forgot to put that in this time as it's been a while
when I read the manual last time.

However, the waveform looks even stranger after I plug in the waveform option.
I have to look into that in more detail.

Regards

Perry

Adam.Tambone@fairchildsemi.com wrote:

> Perry,
>
> There are two options in HSPICE that allow you to use V-t data of the
> rising and falling waveforms of the IBIS model instead of the Ramp data in
> the IBIS model. If you do not specify these options then by default HSPICE
> will use the Ramp data.
>
> They are...
>
> ramp_fwf = 0 or 1 or 2
> ramp_rwf = 0 or 1 or 2
>
> If you specify 0 then ramp data will be used.
> If you specify 1 then 1 waveform will be used.
> If you specify 2 then 2 waveforms will be used.
>
> See Chapter 19 of the most recent Star-HSPICE Manual (2000.4) for a full
> explanation.
>
> Adam Tambone
>
> "Perry Qu" <perry.qu@alcatel.com> on 06/19/2001 10:45:05 AM
>
> To: IBIS group <ibis-users@eda.org>
> cc:
>
> Subject: using IBIS in HSPICE
>
> Hi!
>
> I tried to do some simulation in HSPICE with a differential driver in
> IBIS format. The driver is a HSTL output and by connecting the driver
> just to a simple 50 ohm load, I observed unrealistic sharp falling edge.
> When I check the HSPICE log file, I have the following message:
>
> ** warning** iob_eles2:102:
> Inconsistency between Ramp and PD/PU data is detected.
> dV_f= 3.2680E-01 V_fwf_max= 3.3000E+00 V_fwf_min= 3.3000E+00
> transition from 80% to 20% is not satisfied
>
> ** warning** iob_eles2:186:
> 099 instances of out-of-range states at falling ramp
> this can detriment accuracy
>
> Any idea how I can correct the problem?
>
> Thanks in advance.
>
> Perry Qu
>
> (See attached file: perry.qu.vcf)

 
Received on Tue Jun 19 10:27:47 2001