1076.1 Table-driven Modeling Subcommittee
June 7, 2010 – 8am PDT – 5pm CEST
Joachim Haase
Agenda
 Call to order
 Volunteer for minutes
 Approval for agenda
 Review plan and refinement
 Discuss requirements analysis steps and solicit volunteers
 Next meeting
 AOB
 Adjourn
Scope
 The intention is to support in VHDL-AMS the description of functional
dependencies y = f(x1, x2, ..., xn) based on a number of (n+1)-tupels
(y, x1, x2, ..., xn).
 Therefore, VHDL-AMS functions that support this task, their arguments, and
their algorithmic behavior shall be defined .
 A reference implementation of a package that contains these functions shall
be worked out.
Table-driven modeling [member-only area]
http://www.eda.org/twiki/bin/view.cgi/P10761/ProjectTableDrivenModeling
What has to be done
 Evaluation of representations of data points
- How to describe the (n+1)-tupels
- Handling of special cases (for instant equidistant axes)
- Order of data points
- Order within a n-tupel
 Methods to provide data points
- supported types (REAL, …)
- arrays
- file formats
 Evaluation of interpolation and extrapolation algorithms
 Reference implementation
- Package
- Test cases
- Documentation
Plan
 Phase 1: Establish the "Requirements for Table Look-Up Modeling with VHDLAMS“ – Finished by 08.2010
 Phase 2: Discussion and selection of algorithms that shall be used. This
concerns the lookup algorithms - interpolation and extrapolation methods –
Finished by 10.2010
 Phase 3: Definition of VHDL(-AMS) function headers and standard package
header resp. – Finished by 12.2010
 Phase 4: Reference implementation of functions and standard package body
resp. – Finished by 04.2011
 Phase 5: Test of the reference implementation – Finished by 06.2011
 Phase 6: Finishing of documentation - proposal for the standard revision Finished by 07.2011
Table-driven modeling [member-only area]
http://www.eda.org/twiki/bin/view.cgi/P10761/ProjectTableDrivenModeling
Starting Point (1)
 User requirements as for instance of
- IBIS Modeling Advanced technology Modeling Task Group
http://www.vhdl.org/pub/ibis/macromodel_wip/
- exchange of data files of different provenience
 Known solutions in other languages
- Verilog-AMS, LRM 3.1- section 9.20
http://www.vhdl.org/verilog-ams/htmlpages/public-docs/lrm/2.3.1/VAMS-LRM-2-3-1.pdf
- Modelica - Modelica Standard Library
http://www.modelica.org/libraries/Modelica
 Known file formats
- Touchstone File Format
http://www.eda.org/ibis/touchstone_ver2.0/touchstone_ver2_0.pdf
- Output files of measurement devices
 Known VHDL-AMS solution
- Package TLU_VDA of library FUNDAMENTALS_VDA
http://fat-ak30.eas.iis.fraunhofer.de
Starting Point (2)
 Requirements for Table Lookup Modeling with VHDL-AMS
Draft Proposals – March 2006
http://www.eda.org/vhdl-ams-old/ftp_files/extensions/TLU/requirements_tlu_modeling_in_vhdl-ams_2006-03.pdf
 Requirements for Table-driven Modeling by Alain Vachoux
http://www.eda.org/twiki/pub/P10761/ProjectTableDrivenModeling/TDM_Requirements.txt
Proposal for next steps
 Review of available information
- User requirements
- Representation of „n-tupels“
- Evaluation of known solutions
 Update of „Requirements for Table Lookup Modeling with VHDL-AMS“
- Revision of requirements
 Start to collect information about applied algorithms
- Interpolation and extrapolation
Next meeting
 Monday, July 5, 2010 – 8am PDT