RE: [IBIS] Model statements and model Selector statements ?

Thanks Bob.
That is good to know, but is this stated clearly in the IBIS spec since
different vendors obviously interprets this differently.

I'll go back to my vendor and discuss the matter.

Best /Anders 

-----Original Message-----
From: Bob Ross [mailto:bob@teraspeed.com] 
Sent: den 29 maj 2008 16:39
To: Anders Ekholm
Cc: IBIS reflector
Subject: Re: [IBIS] Model statements and model Selector statements ?

Hi Anders:

The [Model Selector] can be positioned anywhere within an IBIS file
after the header information as long as it is outside of the scope of
[Model], [Component] or some other keywords at the same level in the
hierarchy tree (Section 3A).  So [Model Selector] can be before, after
in in between these other keywords.

Ibischk4 should be correct.

Bob



Anders Ekholm wrote:
> Hi everybody.
> I did run into a question when I was working on an FPGA model 
> containing a number of [Model Selector] sections I did declare a 
> [model] section with a complete model before the [Model Selector] 
> sections and the rest of the [Model] sections after the [Model 
> Selector].
> 
> While doing this it came to mind, how is IBIS suppose to work does all

> references made in a [Model Selector] have to be declared after the 
> [Model Selector]
> 
> or can the be in front of the [Model Selector] ? In my case the 
> [Model] in front of the [Model Selector] was not refereced in the
[Model Selector].
> 
> The ibis checker said it was okay. The question is, is this okay ?
> 
> I did run another vendors checker and it complained.
> 
> Who is in error here the standard checker or my vendor checker ?
> 
> eg.
> 
> [Model] A
> ..
> ..
> ..
> .
> 
> [Model Selector] AA
> A
> B
> C
> |End
> 
> 
> Is this okay IBIS syntax or does it need to be:
> 
> [Model Selector] AA
> A
> B
> C
> |End
> 
> [Model] A
> ..
> ..
> ..
> .
> 
> 
> Or even as in my case:
> 
> [Model] D
> ..
> ..
> ..
> .
> 
> [Model Selector] AA
> A
> B
> C
> |End
> 
> Is this okay IBIS syntax ?
> 
> I did have a look in the 4.2 spec, but I could not find any reference 
> to which of the ones in the example is okay or not, but the spec is 
> sort
> 
> of writen in an order that implies that the [Model] statements  has to

> come after the [Model Selector] statements.
> Maybe I missed explicit specifications of this or all of them are okay
?
> 
> Best /Anders Ekholm
> 
> 
> ---------------------------------------------------------------
> Anders Ekholm
> Senior Specialist Signal Integrity
> CDU and DXU HW design
> 
> Ericsson Product Development Unit BTS
> SE-164 80 Stockholm, Sweden
> Tel: +46 8 404 27 58
> Fax: +46 8 757 23 40
> email: anders.ekholm@ericsson.com
> ---------------------------------------------------------------
> 
> 
> 
> 
> 
> --
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--
Bob Ross
Teraspeed Consulting Group LLC     Teraspeed Labs
121 North River Drive              13610 SW Harness Lane
Narragansett, RI 02882             Beaverton, OR 97008
401-284-1827                       503-430-1065
http://www.teraspeed.com           503-246-8048 Direct
bob@teraspeed.com

Teraspeed is a registered service mark of Teraspeed Consulting Group LLC


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