[IBIS] Model statements and model Selector statements ?

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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