Re: Question on Ramp

Bernhard,

It may not be obvious from the spec defination of [Ramp] but
under 'NOTES ON DATA DERIVATION METHOD' at the end of the spec,
section 3 talks more in details about the pullup to Vcc and
pulldown to GND for various I/O structures.

Regards,
Syed

>
> Syed,
>
> you wrote s2ibis2 will add 50Ohms pullup to calculate=20
> dV/dt_f and 50Ohms pulldown to calculate dV/dt_r values.
> Looking in the [RAMP] specification of 2.1 IBIS spec. there=20
> is only a definition for a R_load sub-parameter but not for a
> termination voltage. The subparameter is optional if the preferred
> 50Ohms load is used.
> Is it obvious that the ramp values given in an IBIS model are valid
> for the following conditions:
>
> dV/dt_f: R_load pullup to VCC ?
>
> dV/dt_r: R_load pulldown to GND ?
>
> Regards,
>
> Bernhard
>
 
Received on Wed Jun 18 12:11:14 1997