Re: For ecl- buffers experts

>
> To ecl- buffers experts:
>
> For ecl buffers, can we have an ibis file with
> 2 rising and 2 falling waveforms (RWF/FWF) ?
>
> I would answer, why not?

  And I would reply, what's the point? An ECL output is not a totem-pole
(pullup/pulldown) structure. The two waveform approach is designed
specifically to isolate a pullup xsistors characteristics from a
pulldown xsistor characteristics, as well as determine the amount of time
between one turning off and the other turning on. This simply just
doesn't apply to the open-emitter output of an ECL device.

   Regards,
   Stephen Peters
   Intel Corp.

>
> However, IBIS specs contains Sec 9, "Notes on
> data derivation methods", which specify how to derive
> rising/falling waveforms. This part specifies, that
> for ecl buffers, the termination voltage, Vterm = Vcc - 2V.
> The only one termination voltage suggests only one
> waveform.
>
> Unlike ECL part, CMOS buffers part recommends
> 2 termination voltages to use: Vdd and Vss, hence
> we can derive 2 FWFs and 2 RWFs.
>
> Any comments, suggestions
>
> Thanks a lot
>
> -------------------------------
> Nikolai Bannov
> Avant! Corporation
> 46871 Bayside Parkway
> Fremont, CA 94538
>
> tel: 510-413-8634
> fax: 510-413-8080
> email: nikolai@avanticorp.com
> -------------------------------
Received on Thu Mar 25 16:55:09 1999