[ibis-macro] Re: Question on Value/Default BIRD
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "IBIS-ATM" <ibis-macro@xxxxxxxxxxxxx>
- Date: Fri, 3 Sep 2010 16:24:45 -0700
I noticed something else regarding Default.
Considering the various Formats we have in the spec:
- Value
- Range
- List
- Corner
- Steps
- Table
- Gaussian
- Dual-Dirac
- DjRj
except for Table, not a single one of these needs
"Default" because they all have a typ, or mean value.
(DjRj may be another one without typ or mean, but
one could take the average of min and max for that).
In the case of the Table, we could use a default
row selection, but I am not even sure how our Default
would actually handle that...
So I really wonder what use there is for Default for
the Reserved Parameters? Shouldn't we just get rid
of it all together?
Thanks,
Arpad
=======================================================
-----Original Message-----
From: Walter Katz [mailto:wkatz@xxxxxxxxxx]
Sent: Friday, September 03, 2010 6:14 PM
To: Muranyi, Arpad; 'IBIS-ATM'
Subject: RE: [ibis-macro] Re: Question on Value/Default BIRD
Arpad,
Of course I would prefer it said this:
| (<parameter_name> (Usage <usage>)(Type <data_type>)
| (<Format type> <data>) (Description <string>))
I think if we decide all of these "Eggs" are good then we can
incorporate
them into a general rewrite which documents everything the way we want
it,
and then makes a note that older files follow the 5.0 rules and EDA
vendor
software should support both - at least during a transition period.
Walter
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Friday, September 03, 2010 7:05 PM
To: IBIS-ATM
Subject: [ibis-macro] Re: Question on Value/Default BIRD
Walter,
I made another observation regarding Default.
The beginning of the "Tx-only reserved parameters" section
on pg. 145 and the "Rx-only reserved parameters" section
on pg. 146 we have a general format description which looks
like this:
| (<parameter_name> (Usage <usage>)(Type <data_type>)
| (Format <data format>) (Default <values>)
| (Description <string>))
but later in the specific parameter discussions there is
not a single example using Default. Shouldn't the general
description of these two sections omit the Default, like
this:
| (<parameter_name> (Usage <usage>)(Type <data_type>)
| (Format <data format>) (Description <string>))
Thanks,
Arpad
============================================================
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Friday, September 03, 2010 5:48 PM
To: IBIS-ATM
Subject: [ibis-macro] Question on Value/Default BIRD
Walter,
I want to ask a question about this BIRD.
My understanding of the Reserved parameters is that they
tell the EDA tool some information about the model. For
example,
| Init_Returns_Impulse, Use_Init_Output, GetWave_Exists,
| Max_Init_Aggressors and Ignore_Bits
are all parameters which provide information about what
the model contains or does, or conditions at which the
model should be operated at. Is the user of the tool and
the model expected to change the values of any of these
parameters? I don't expect that this would make sense...
In that case, why should we allow Default at all? I don't
see that there would ever be a choice to make with these
parameters. Shouldn't this BIRD simply replace the Default
with Value instead of allow both?
Thanks,
Arpad
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