Re: IBIS pin mapping questions

Dear Frank Azema,

> I try to simulate my electronics designs after layout design. I use QUAD
> ANALYZE simulator which include a converter from IBIS model to Quad model to a
> specific part : typ, min or max.
> The logic and physical symbol of the design tools i use are made with the
> specification pin mapping of the manufacturer of the component. In example on
> a microprocessor of Motorola ( the MPC823 microprocessor) the pin mapping is
> an alpha-numeric grid, so i associate the signal name of the data sheet with
> the pin alpha-numeric number in my symbols.
> I found the IBIS model of this microprocessor on the web of Motorola and i try
> to use it. Many errors appeared after converting manipulation to use this
> model. In fact the pin number of the symbol and the pin number of the model
> are different. So the simulator didn't look for the good [model] and the
> simulation gave bad result. So, i correct the pin number mapping and it was
> good for new simulation.
>
> In an other design i use the AMD microprocessor AM186er. I ask AMD for IBIS or
> simulation model and their give me the IBIS model AND the Quad model. So, i
> use it and errors appear because the pin number mapping doesn't correct with
> the manufacturer data sheet. Here the pin number mapping in only numeric in
> opposition of the motorola component.
>
> MY QUESTION is about the pin number mapping method of a IBIS model. How can i
> found the right method which explain how to make this ? WHY isn't it in phase
> with the data sheet ? i didn't found any application note on the subtract of
> it on your web site.
> My pivot table to correct the pin number mapping is the signal name mapping
> but it isn't every time exactly the same of the data sheet of the
> manufacturer. My contact on different manufacturer can not explain me how the
> ibis model make because it is very big company and the can't find the ibis
> creator.
>
> So, are there a method official from IBIS group for this syntax of pin number
> mapping and signal name mapping ?
>
> I thank you answer and i give you a merry christmas and a happy new year.
> Frank AZEMA ALCATEL BUSINESS SYSTEMS
> Technical direction 1, route du Dr Albert Schweitzer
> Tel : +33(0)3 88 67 77 00 F-67408 ILLKIRCH-GRAFFENSTADEN Cedex
> Fax : +33(0)3 88 67 70 83
> <mailto:Franck.Azema@sxb.bsf.alcatel.fr>

I am forwarding your question to the IBIS Users Group e-mail reflector and
have added you to that reflector so that you will receive any discussions
raised by your question.

If I understand your question correctly, it sounds like the creators of the
IBIS files did not give complete pinouts for the parts. In my opinion, a
COMPLETE IBIS file lists every pin on the part in the [Pin] section of the
[Component]. If the part is available in multiple packages then the IBIS file
could contain multiple [Component] sections or multiple files may be created.
Furthermore, I believe it silly for the creators of the IBIS files to use pin
and signal names that are inconsistent with the datasheet. (The IBIS
specification actually requires a full pinout for each [Component] and
specifically says that the pin/signal names should be as given on a
datasheet.)

Regards,

Matthew Flora
IBIS Open Forum Secretary
(425) 869-2320 PH
(425) 881-1008 FAX
mbflora@hyperlynx.com
HyperLynx, 17641 NE 67th Court, Redmond, WA 98052 USA
Received on Thu Dec 17 08:27:14 1998