[ibis-macro] Re: Ccomp valid and/or to be used, when moving to on-die S-parameters?
- From: Walter Katz <wkatz@xxxxxxxxxx>
- To: "Mirmak, Michael" <michael.mirmak@xxxxxxxxx>, <DBanas@xxxxxxxxxx>, <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 11 Mar 2014 15:22:39 -0400 (EDT)
MM,
Exactly so, see IBIS 6.0 page 91.
"The intent behind [External Model] is to provide an upgrade path from
native IBIS [Model]s to the external languages (one exception to this is
the support for true differential buffers). Thus, the [External Model]
keyword can be used to replace the usual I-V and V-T tables, C_comp,
C_comp_pullup, C_comp_pulldown, C_comp_power_clamp, C_comp_gnd_clamp
subparameters, [Ramp], [Driver Schedule], [Submodel] keywords, etc. of a
[Model] by any modeling technique that the external languages allow. For
[External Model]s, the connectivity, test load and specification
parameters (such as Vinh and Vinl) are preserved from the [Model] keyword
and the simulator is expected to carry out the same type of connections
and measurements as is usually done with the [Model] keyword. The only
difference is that the model itself is described by an external language."
Since on-die S-parameters are implemented in External Model, then "C_comp
as a sub-parameter should be completely ignored in the presence of on-die
S-parameters".
Walter
From: Mirmak, Michael [mailto:michael.mirmak@xxxxxxxxx]
Sent: Tuesday, March 11, 2014 3:17 PM
To: wkatz@xxxxxxxxxx; DBanas@xxxxxxxxxx; ibis-macro@xxxxxxxxxxxxx
Subject: RE: Ccomp valid and/or to be used, when moving to on-die
S-parameters?
Does this mean that C_comp as a sub-parameter should be completely ignored
in the presence of on-die S-parameters? So far, this exchange implies so.
- MM
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz
Sent: Tuesday, March 11, 2014 12:15 PM
To: DBanas@xxxxxxxxxx; ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Ccomp valid and/or to be used, when moving to
on-die S-parameters?
David,
it get subsumed into the Touchstone model
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of David Banas
Sent: Tuesday, March 11, 2014 3:12 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Ccomp valid and/or to be used, when moving to on-die
S-parameters?
Hi Experts,
As we move away from I/V and V/T tables and towards on-die S-parameters to
model the analog behavior of output buffers, does Ccomp remain relevant as
an independent circuit element, or does it get subsumed into the
Touchstone model, for instance?
Thanks,
-db
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