Re: duplicate models in a Driver Schedule

Mike:

It is permitted to use the same model several times under
[Driver Schedule], as you have shown. There is no statement
in the Specification that prohibits this. Also, ibischk3 permits
this syntax.

Bob Ross
Mentor Graphics

> Date: Fri, 19 Mar 1999 08:23:28 -0500
> From: Mike LaBonte <mikelabonte@cadence.com>
> To: IBIS Users <ibis-users@vhdl.org>
> Subject: duplicate models in a Driver Schedule

> It is not clear to me whether or not model names that appear in the
> [Driver Schedule] section of an IBIS file must be unique. In the IBIS
> spec example, a different model name is used on each line. But the
> description text does not require that they must be unique.

> So my question is, could a [Driver Schedule] section legally use
> the same model name twice? Something like this:

> [Driver Schedule]
> | Model_name Rise_on_dly Rise_off_dly Fall_on_dly Fall_off_dly
> MODEL_OUT 0.0ns NA 0.0ns NA
> MODEL_OUT 0.5ns NA 0.5ns NA

> In other words, what if both stages turn on/off at different times,
> but are otherwise identical?

> Mike LaBonte

> P.S. Here is the ver_3.0.ibs example, for reference:

> [Driver Schedule]
> | Model_name Rise_on_dly Rise_off_dly Fall_on_dly Fall_off_dly
> MODEL_OUT 0.0ns NA 0.0ns NA
> |
> | Examples of added multi-staged transitions
> M_O_SOURCE1 0.5ns NA 0.5ns NA
> | low (high-Z) to high high to low (high-Z)
> M_O_SOURCE2 0.5n 1.5n NA NA
> | low to high to low low (high-Z)
> M_O_DRAIN1 1.0n NA 1.5n NA
> | low to high (high-Z) high (high-Z) to low
> M_O_DRAIN2 NA NA 1.5n 2.0n
> | high (high-Z) high to low to high
> | Bus-hold stage
> M_O_DRAIN3 NA 1.0n NA 0.5n
> | high (high-Z) to low low to high (high-Z)
Received on Fri Mar 19 13:36:51 1999