RE: [IBIS] BIRD95: Power Integrity Analysis Using IBIS

Mike,

This is an example that has been removed from BIRD95. Our attempt at
showing the interaction of VDD and VSS using [Series Pin Mapping]:

---------------
.
.
|
[PIN] signal_name model_name R_pin L_pin C_pin
|
A1 VDD Power
A2 NC NC
A3 VSS GND
|
|
[Series Pin Mapping] pin_2 model_name function_table_group
|
A1 A3 NoiseSource
|
|
[Model] NoiseSource
Model_type Series
.
.
-----------------
Syed
IBIS Vice-Chair & Webmaster
Cisco Systems, Inc

On Mon, 2005-01-10 at 13:06, Mike LaBonte wrote:
> The IBIS keyword that loosely associates power and ground pins with groups
> of buffers is [Pin Mapping], not [Series Pin Mapping]. Certainly the name of
> the [Series Composite Current] keyword is unimportant compared to the
> technical issues. But if further discussion of other issues leads to a
> revision of the BIRD, I think that will be a sufficient sign of hope to
> warrant reconsideration of the keyword name.
>
> Mike
>
> -----Original Message-----
> From: Syed Huq [mailto:shuq@cisco.com]
> Sent: Saturday, January 08, 2005 2:47 PM
> To: Mike LaBonte
> Cc: ibis
> Subject: RE: [IBIS] BIRD95: Power Integrity Analysis Using IBIS
>
> Mike, Thanks for your comments, some of my responses in-line - Syed
>
> On Fri, 2005-01-07 at 10:57, Mike LaBonte wrote:
>
> > 5) Why is it called [Series Composite Current]? If this is the series
> > current into the power port of the buffer what would be called the
> > shunt current? Inside the buffer we might regard this current as a
> > composite of pullup, predriver, and various capacitance currents. But
> > treating the buffer as a black box, isn't there only one I/O (excluding
> clamp) power terminal?
> > Could we call it [Power Current]? That would also make for a neater
> > syntax if there ever is a [Ground Current] keyword.
> >
>
> The first version of the BIRD was using Series Pin Mapping to show how the
> PWR GND nodes are connected etc and as such we wanted a new keyword for the
> IvsT to have some relation to that. So the name [Series Composite Current].
> We will wait further before making more changes to keyword names.
>
> Regards,
> Syed
> --
> IBIS Vice-Chair & Webmaster
> Cisco Systems, Inc
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