Subject: Re: [IBIS] Parameterization in BIRD 75
From: Ross, Bob (bob_ross@mentorg.com)
Date: Thu Sep 19 2002 - 12:46:46 PDT
Ian:
Thank you for your comments and support.
The initial proposal forces the parameters to be
already initialized in the external file. So, I
intialization is redundant. Furthermore, the
file needs to be run without any parameters new
parameters defined. Control is passed through
the IBIS format (by just listing the parameter names)
to the controling structure, script or interface.
Anyway, these are my thoughts on how to add this
mechanism with the most simple syntax and without
getting into a lot of syntax choices and complications.
Bob Ross
Mentor Graphics
"Dodd, Ian" wrote:
>
> To All,
>
> Sorry for the delay in following up my comments in the Open Forum.
>
> I'm very keen to have a Parameterization feature for external models.
>
> If we add this feature, I would expect simulation tools
> would provide a mechanism for the user to enter values for the parameters
> in an interactive fashion.
>
> To do this the following information would be necessary:
>
> parameter name
> parameter value
>
> In addition it would be useful to have the following additional information
>
> parameter type
> default value
> value validation range
> units
>
> Bob's proposal of quoting parameter values that textual, implicitly
> gives the parameter type as numeric or textual.
>
> This does not distinguish floating point from integer values.
> That additional information would be useful for validating the
> value in a form, but I personally think we could live without it.
>
> I think we could also live without the validation range.
>
> I think we should require a default value for each parameter
> and allow it to be followed by an optional units string as per other
> IBIS fields. If the units are present, a form prompting for parameter
> values should be free to display the appropriate units.
>
> Based upon my comments, I would suggest we could amend the parameter
> section from
>
> Parameters r1 l1
> Parameters r2 l2 temp
>
> to
>
> Parameters r1 = 15ohms l1 = 10mH corner = "min process"
> Parameters r2 = 25 l2 = 22m temp = 75degF
>
> or better still
>
> Parameter r1 = 15ohms
> Parameter l1 = 10mH
> Parameter corner = "min process"
> Parameter r2 = 25
> Parameter l2 = 22m
> Parameter temp = 75degF
>
> I think the second form is better because it would allow us to more easily
> add additional information to each parameter (such as ranges) in a future BIRD.
>
> We might also achieve this by requiring explicit (comma?) delimiters
> between entries in the first form.
>
> Ian Dodd
> Mentor Graphics Inc
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