Re: [IBIS] Mult-Lingual Model Support in IBIS

Hello Shulong:

You are correct. However, I recommend that you delay implementing this
part of IBIS Version 4.1. Even the pending IBIS parser will flag this
disconnect as an Error. So I would wait for a formal solution per
the comments below.

Regards,
Bob

slwu wrote:

> Hi Bob,
>
> I think EDA tool may not know which die pad is connected to a certain pin,
> so it seems impossible for EDA tool to construct such a connection
> automatically.

Correct.

> However, if such connections are provided by model users in his circuit netlist
> directly,
> then EDA tools can construct the connection as the model users expect.
> Is my understanding right ?

In theory, yes. However, at this time I would simply avoid adding such
a connection capability and wait for the IBIS Committee to propose
a solution for Version 4.2 with the appropriate new syntax.

>
> Thanks very much
> Shulong
>
> Bob Ross wrote:
>
>
>>Hello Shulong:
>>
>>In IBIS Version 4.1, there is no direct method to connect the
>>die pads to pins listed below. As you discovered, there is no
>>reference through [Circuit Call]s for such a connection. So at
>>this time the EDA tool would have to provide the connection outside
>>of the IBIS syntax.
>>
>>However, solutions are being discussed and should lead to a
>>proposal for IBIS Version 4.2. The proposals will probably involve
>>some linkage syntax involving IBIS and the Interconnect Model Specification
>>(ICM) for a more general package model.
>>
>>Regards,
>>Bob
>>
>>slwu wrote:
>>
>>
>>>Hi,
>>>
>>>I am still not very clear...so giving an exact example may be more
>>>understood for me.
>>>In the diagram on Page 112 of the IBIS 4.1 specification, there are several
>>>
>>>connections between die pads and pins that I can not understand how they
>>>are constructed through [Circuit Call]s on Page 113~114
>>>1. "pad_11" <====> "11"
>>>2. "pad_2a"/"pad_2b" <====> "2"
>>>3. "pad_4" <===> "4a" /"4b"
>>>
>>>Thanks very much
>>>slwu
>>>

-- 
Bob Ross
Teraspeed Consulting Group LLC     Teraspeed Labs
121 North River Drive              13610 SW Harness Lane
Narragansett, RI 02882             Beaverton, OR 97008
503-750-6481                       503-430-1065
http://www.teraspeed.com           503-246-8048 Direct
bob@teraspeed.com
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