[ibis-macro] Re: A question about "Value"
- From: "Mirmak, Michael" <michael.mirmak@xxxxxxxxx>
- To: "twesterh@xxxxxxxxxx" <twesterh@xxxxxxxxxx>, 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx>
- Date: Fri, 21 Sep 2012 18:29:52 +0000
This line first appears in the editorial drafts starting with v. 0.125 in late
February/early March of this year, when Section 10A was first reformatted
(http://www.eda.org/ibis/editorial_wip). It has appeared in every review draft
since, both in the IBIS Open Forum and in the Editorial task group.
Please feel free to submit a BIRD with the correct text at the earliest
opportunity.
- MM
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Todd Westerhoff
Sent: Friday, September 21, 2012 10:26 AM
To: 'IBIS-ATM'
Subject: [ibis-macro] Re: A question about "Value"
Agreed. This is an error in the IBIS 5.1 spec.
Todd.
Description: cid:EAFF2D52-4B63-4A05-9D24-B96BE375B7E0@eau.wi.charter.com
Todd Westerhoff
VP, Software Products
Signal Integrity Software Inc. * www.sisoft.com<http://www.sisoft.com/>
6 Clock Tower Place * Suite 250 * Maynard, MA 01754
(978) 461-0449 x24 * twesterh@xxxxxxxxxx<mailto:twesterh@xxxxxxxxxx>
"I want to live like that "
-Sidewalk Prophets
From: ibis-macro-bounce@xxxxxxxxxxxxx<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx]<mailto:[mailto:ibis-macro-bounce@xxxxxxxxxxxxx]>
On Behalf Of Walter Katz
Sent: Friday, September 21, 2012 12:02 PM
To: Arpad_Muranyi@xxxxxxxxxx<mailto:Arpad_Muranyi@xxxxxxxxxx>; 'IBIS-ATM'
Subject: [ibis-macro] Re: A question about "Value"
Arpad,
If a parameter has (Value <value>) then the model writer says use <value>
period. Compliant usage of this model will not allow its value to be changed.
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx]<mailto:[mailto:ibis-macro-bounce@xxxxxxxxxxxxx]>
On Behalf Of Muranyi, Arpad
Sent: Friday, September 21, 2012 11:56 AM
To: 'IBIS-ATM'
Subject: [ibis-macro] A question about "Value"
Hello,
It was just brought to my attention that the IBIS v5.1 specification
says the following on pg. 177:
"Value <value>
Single value data. The user may assign any value without any restrictions
within the constraints of the Type of the variable."
I remember asking a question in the ATM group a while ago about Value
and Default. Parameters using these format types contain a single
value in the .ami file, and the question I asked was whether the EDA
tool should display these types of parameters in a GUI dialog and
allow the user to change them or not. If I remember correctly, the
answer was that for these types of parameters the model maker knew
what the value should be and the reason they picked Value or Default
as opposed to Range or List is because they only had one possible value
in mind for the model. Therefore the EDA tool should not allow these
parameter values to be changed by the tool user.
However, reading the above sentence in IBIS v5.1 gives me the impression
that the tool user should be allowed to make changes for these types of
parameters, and consequently the EDA tool should provide an editable
field for these parameters for the user.
Was this written this way intentionally? Or is this sentence worded
incorrectly? If the latter, I think we need to write a BIRD to
correct it...
But here comes a complication. If we intend to allow the user to edit
these types of parameters, then what should we do with AMI_Version?
AMI_Version is a Usage Info, Format Value parameter which should really
not be edited by anyone, but according to the definition of "Value",
the user of the model is allowed to change it to any legal value.
I know AMI_Version currently can only have one value "5.1", but later
we will have other possible IBIS version values, and this rule might
cause problems.
There might be other parameters which fall into a similar situation
regarding this rule.
Thanks,
Arpad
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