[ibis-macro] IBIS-ATM teleconference - Agenda for August 5, 2014
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 5 Aug 2014 15:03:51 +0000
Time: Tuesday, August 5, 2014 at Noon US Pacific Time
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Agenda
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1) Opens
- Mike L. is unable to attend today, we need a volunteer to take minutes
2) Call for any related patent disclosures
3) Review of ARs:
Arpad: Work with Randy to update BIRD 173
- in progress
Bob and Ambrish: Update BIRD 147
- in progress or done?
Ambrish: Examine BIRD 128 for possible BIRD 147 updates
- in progress or done?
Any other AR-s?
4) Roll call
INFORMATION: There is a proposal on the table to not allow the usage
of Node0 for package and interconnect modeling in IBIS_ISS
subcircuits.
5) BIRD 128 Allow AMI_parameters_out to pass AMI_parameters_in
data on calls to AMI_GetWave (Ambrish)
- discussion
6) BIRD 147.1 and co-optimization (Bob/Ambrish)
- discussion on recent changes in BIRD 147.1
7) BIRD 173 (Arpad)
- the following rules were sent to Randy for BIRD 173
#a) Assumption is that the package RLC structure is passive, which
necessitates positive definite matrixes from which come the
following requirements for the matrix elements. We could also
mention that coupling or losses due to L and R are associated
with current (through variable), but coupling in C is associated
with voltage (across variable), which is why there are differences
in the rules between them.
#b) Matrix C should belong to the class of M-matrices, but L and R
should be inverse M-matrices. All should be positive definite.
See e.g. http://en.wikipedia.org/wiki/M-matrix about M-matrices.
#c) Symmetry must be assumed for all of them: R, L, C.
#d) Off-diagonal entries of the capacitor matrix should be non-positive.
Diagonal entries should be non-negative. In addition, diagonal
entries should make 'diagonal dominance': each element on the
diagonal should be larger than the sum of modules of the non-diagonal
components in the same row or same column. This condition ensures
the capacitance matrix be positive-definite, and the RCL structure
passive. Non-passivity should not be allowed.
#e) Diagonal elements of the inductance matrix should be non-negative
(positive or zero). Each diagonal element should be larger than
absolute values of any of the non-diagonals that belong to the same
row or column. Matrix L should also be positive definite (all its
eigenvalues are positive or zero), but this condition is more difficult
to check than for C-matrix. Possible check: find the matrix X=inv(L).
Then, X should satisfy the same criteria as was stated for capacitance
matrix C.
#f) Resistance matrices have the same requirements as the inductance matrices.
In many cases, however, we don't consider mutual resistance, in which
case R becomes diagonal matrix.
8) New Redriver BIRD (Walter)
- discussion on the new BIRD draft to correct the Redriver flow
9) Ambiguous directionality (BUG150) (Mike M.)
- (not a bug, waiting for discussion)
- for AMI modeling we have no indication whether the model is
Input, Output or I/O
10) How to handle missing min/max data? (Arpad)
- should the specification have rules about this
Tabled topics:
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AR:
Walter: Collect IC vendor (user) statements regarding their
packaging needs
- tabled
11) The IBIS specification does not define what character set
is allowed in the .ami files. Some files contain double
quotes 93h and 94h instead of 22h. Are these legal?
12) Technical discussion on filter/analog driver (C_comp related
improvements to spec)
13) BIRD 157 Parameterize [Driver Schedule] (Arpad)
- discussion
14) Info, Out, InOut BIRD (Arpad)
- latest wording includes "in order to be compliant with this
specification, Model_Specific parameters ... must not ...",
and omits the word "simulation" so it's meaning doesn't have
to be defined
- questions/comments/discussion?
15) DLL error trapping and return codes (Greg Edlund)
- address the nasty condition where the DLL and tool crash
without a trace. The EDA vendor says, "I can't help you
because I can't see inside the model." The model vendor
says, "I can't help you because I don't own that tool."
The user is left with a non-functional model.
16) Overclocking
17) Macro models for power delivery
Thanks,
Arpad
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