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

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

"Mirmak, Michael" wrote:

> Shulong,
>
> Thank you for your interest in IBIS 4.1. You raise several important
> issues.
>
> 1) As you pointed out, IBIS 4.1 die pads are treated like any other
> internal node: they are declared under [Node Declarations] and are
> mapped to ports through [Circuit Call].
>
> Use the keyword CIRCUITCALL in the [Pin] list to link a particular pin
> to the [Circuit Call] declarations later in the file. [Circuit Call]
> associates, where appropriate, particular pins with buffer ports and
> nodes through the Signal_pin and Port_map subparameters.
>
> 2) Note that [Circuit Call] may make both explicit and implicit
> connections. If the node listed under [Circuit Call] Port_map matches a
> pin name from the [Pin] list, the node is assumed to be the pad of the
> associated buffer (see the [Circuit Call] Model_C example on page 113 of
> the IBIS 4.1 specification). All [Circuit Call]s for a [Component]
> should be read in before implicit associations are assumed, as some
> [Circuit Call] declarations may impact others (for example, shared power
> supply connections).
>
> Finally, the IBIS Open Forum is aware that some applications may demand
> identification of analog ports and nodes as distinct from digital ports
> and nodes. Several options are being discussed in the IBIS Futures
> Committee and an appropriate solution will likely be included in IBIS
> 4.2.
>
> - Michael Mirmak
> Intel Corp.
> Chair, EIA IBIS Open Forum
>
>
> -----Original Message-----
> From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of slwu
> Sent: Tuesday, November 09, 2004 5:52 PM
> To: ibis-users@eda.org; ibis@eda.org
> Subject: [IBIS] Mult-Lingual Model Support in IBIS
>
> Hi all,
>
> When I use this feature in Component, I found if an analog I/O port
> mapped to an explicit die pad, it is no other statement to map this
> explicit die pad to a pin listed under [Pin] keyword. Furthermore, I do
> not know which port in [External Circuit] is an analog I/O port, since
> analog port in [External Circuit] has not reserved keyword names to
> indicate its character. Although keyword "Signal_pin" and
> "Diff_signal_pins" give a mapping from an analog I/O port to a pin,
> which port is the right I/O port ?? So from my understand, I can not
> construct a connection between an analog I/O port within [External
> Circuit] and a pin listed under [Pin] keyword if using explicit die pad.
> Could anybody give me some explanations or advices ?
>
> Thanks very much
> slwu
>
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Received on Tue Nov 9 21:05:40 2004