[ibis-macro] Re: Question about GetWave_Exists

Ambrish,

 

Even though I tend to agree with you, I wonder

what was the purpose of putting this parameter

into the AMI specification.

 

The reason I wonder is because any programmer

skillful in the art knows how to obtain the

entry points to the functions in a DLL, i.e.

they can figure it out programmatically whether

the function exists or not, and if they are

careful programmers, they will not call the

function if the pointer to it is a null…

 

Having that in mind, who is this information in

the .ami file targeted to, and for what purpose?

 

Thanks,

 

Arpad

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From: Ambrish Varma [mailto:ambrishv@xxxxxxxxxxx]
Sent: Wednesday, March 07, 2012 4:22 PM
To: Muranyi, Arpad; 'IBIS-ATM'
Subject: RE: Question about GetWave_Exists

 

Arpad,

The parameter value was supposed to be an answer to the question Getwave Exists in the AMI model or not?

So I do believe that the .ami file was written incorrectly.

Thanks,

-Ambrish.

 

 

	Ambrish Varma   |  Member of Consulting Staff
	P: 978.262.6431   www.cadence.com

 

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From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Wednesday, March 07, 2012 5:05 PM
To: 'IBIS-ATM'
Subject: [ibis-macro] Question about GetWave_Exists

 

Hello everyone,

 

I would like to ask a question about the GetWave_Exists

AMI parameter.  This is what I see in the specification

on pg. 144:

 

 

| GetWave_Exists:

|

| GetWave_Exists is of usage Info and type Boolean. It tells

| the EDA platform whether the “AMI_GetWave” function is

| implemented in this model. Note that if Init_Returns_Impulse

| is set to “False”, then Getwave_Exists MUST be set to “True”.

 

 

I came across a model recently in which the AMI DLL does have

a GetWave function, but the .ami file says GetWave_Exists = False.

The vendor says that they want to use this AMI parameter as

a switch to be able to tell the EDA tool whether to invoke

the GetWave function or not.

 

The way I read the above specification snippet is that this

parameter supposed to tell the tool whether this function

exists in the DLL or not.  If this parameter was to be used

to control whether the EDA tool should make use of it or not,

we should have given this parameter a different name, something
like this:

 

Use_GetWave_Function_If_Exists

 

I am curious to hear what our experts have to say about this.

Is the model’s .ami file written incorrectly?  Should we advise

the model maker to not use this AMI parameter this way?

 

How should the EDA vendor handle this situation?  Should the

tool execute the GetWave function when it exists, regardless

of what this parameter says, or should it only execute the

GetWave function if this parameter is set to True, regardless

of whether the GetWave function exists in the DLL or not J.

 

Thanks,

 

Arpad

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