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---++ IEEE P1076.1 Working Group - Table-Driven Modeling Project - Telco Metting Minutes of July 5, 2010

<strong>Status: </strong><em>approved </em><em>on </em> _August 9, 2010._

%TOC%
---+++ Attendees
   * Ernst Christen
   * Joachim Haase (chair, meeting convener)
   * Arpad Muranyi
   * Alain Vachoux (note taker)
---+++ Agenda
   * Call to order
   * Approval for agenda
   * Review and approve minutes from June 7 meeting
   * Review action items and any content provided from them
   * Discussion of TDM Requirements document
   * Next meeting
   * AOB
   * Adjourn
---+++ Call to order on July 5, 2010 at 8am PST (5pm CEST)

Joachim welcomes the participants and starts presenting the [[%PUBURL%/%WEB%/ProjectTableDrivenModeling/1076.1_table_driven_modeling_2010_07_05.ppt][meeting slides]].
---+++ Volunteer for minutes

Alain volunteers to take notes.
---+++ Approval for agenda

Agenda unanimously approved.
---+++ Minutes from last meeting

Minutes of June 5, 2010 meeting unanimously approved.
---+++ Current action items

Alain:
   * Register Arpad to the Twiki site.<em> <span style="color: darkgreen;" class="WYSIWYG_COLOR">- done</span></em>

Arpad:
   * Provide links to places in IBIS web site related to table-driven modeling. <em><span style="color: darkgreen;">- done</span></em>

Discussion (see [[%PUBURL%/%WEB%/ProjectTableDrivenModeling/tables_in_ibis.txt][Tables in IBIS]] and [[http://eda.org/pub/ibis/ver5.0/ver5_0.pdf][IBIS Specification version 5.0]]):
   * Two kinds of tables: I-V tables (DC) and waveform tables (transient).
   * Not fully populated grids are supported.
   * Only linear interpolation is required.
   * Tables have size limits (I-V: 100 points, waveform: 1000 points).
   * Suggestion to have parameters for lookup functions such as pin, model, etc.
   * Need to index waveforms with V_/R_/L_/C_fixture. R_fixture and V_fixture are the most important ones.
   * Most tools support up to 4 waveforms in a model (pull-up, pull-down, turned-off, turned-on).
   * No need to necessarily implement the full IBIS table processing.
   * Need examples in IBIS 5.0.
   * IBIS models include more information than table data.
   * Arpad implemented a prototype IBIS to VHDL-AMS Perl translator.

Joachim:
   * Provide information related to table-driven modeling from the Modelica environment. <em><span style="color: darkgreen;">- done</span></em>

Discussion (see [[%PUBURL%/%WEB%/ProjectTableDrivenModeling/tables_in_modelica.pdf][Tables in Modelica]]):
   * The so-called "temporary functions" must be replaced by other functions in the future.
   * The so-called "CombiTableXX" are components that must be instantiated the model.
   * More details on the Matlab 4 storage format are needed. However, it is more important to define how to interpret data. File format is a secondary issue.
   * The "ContinuousDerivative" smoothness is related to linear and cubic splines.
   * Periodic extrapolation is supported in Modelica and should be added to the requirement list.
   * Support of step functions (discontinuities) not possible if data grid is not required to be ordered. Supporting the nearest/closest data point interpolation method could however help.

Ernst:
   * Look at the requirements and consequences of supporting multiple dependent variables. <em><span style="color: darkgreen;">- open<br /></span></em>
   * Look at how Verilog-AMS control strings are actually working. <em><span style="color: darkgreen;">- in progress</span></em>

Discussion (mostly on table support in Verilog-AMS; see [[%PUBURL%/%WEB%/ProjectTableDrivenModeling/cubic_spline_interpolation_dahlquist_bjoerck.pdf][Cubic spline interpolation in Verilog-AMS]]):
   * Ernst did an inventory of the support of control strings in different versions of Verilog-AMS and different tools. No result in well organized form yet.
   * Quadratic spines may have oscillation problems.
   * Multi-dimensional spline interpolation as supported in Verilog-AMS uses relatively simple algorithm.
   * Data point ordering may be costly be it must be done once and should speed up the accesses and the interpolation.
   * We must define the format of the conditioned (e.g. ordered) tables and mappings from standard file formats.

Alain:
   * Update requirement document from the meeting discussion.<span style="color: darkgreen;" class="WYSIWYG_COLOR"> _-_ _version 0.2 published on web site_ </span>

Discussion:
   * <span style="color: black;" class="WYSIWYG_COLOR">In the 1D case closest data point method (interpolation) and periodic extrapolation method (cmp. Modelica) should be supported.</span>
   * <span style="color: black;" class="WYSIWYG_COLOR">Independent variables of table functions shall be of real type (scalar or vector).</span>
   * <span style="color: black;" class="WYSIWYG_COLOR">The approach shall support dependent variables of real type. It may support complex dependent variables. <br /></span>
   * <span style="color: black;" class="WYSIWYG_COLOR">It has to be clarified what are the consequences if real arrays are supported by the functions.</span>
   * <span style="color: black;" class="WYSIWYG_COLOR">The consequences of the requirement to ignore changes of data points after the first call (TDM-R11 in v0.2) have to be investigated. Thus, the requirement should be removed fro the current version of the requirements.</span>
   * <span style="color: black;" class="WYSIWYG_COLOR">It was recommended to reformulate requirements concerning the description of the data base and the formats that should be supported.</span>
---+++ Next meeting

The next telco is planned on August 9, 2010 at 8:00am PDT or 5:00pm CEST.
---+++ <a name="AOB"></a> AOB

None.
---+++ <a name="Adjourn"></a> Adjourn

Joachim adjourns the meeting at 6:30 CEST.
---+++ Action items

Alain:
   * Update requirement document from the meeting discussion.

Arpad:
   * Provide examples of the use of tables with IBIS 5.0.
   * More details on the prototype IBIS to VHDL-AMS Perl translator.

Ernst:
   * Look at the requirements and consequences of supporting multiple dependent variables.
   * Writeup on the use of Verilog-AMS control strings with different language definition versions and tools.

Joachim:
   * Details on the Matlab 4 storage format.
Topic revision: r1 - 2016-01-24 - 01:45:46 - TWikiGuest
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