-- JoachimHaase - 2012-10-02

IEEE P1076.1 Working Group - Table-Driven Modeling Project - Telco Meeting Minutes of September 25, 2012

Status: draft


  • Ernst Christen
  • Joachim Haase (meeting convener, note taker)


  • Call to order
  • Volunteer for minutes
  • Approval of agenda
  • Review and approve minutes from the last meetings
  • Examples and experiences using TDM functionality
  • Decision how to continue
  • Next meeting
  • AOB
  • Adjourn

Call to order on September 25, 2012 at 8:05 am PDT (17:05 CEST)

Joachim opens the meeting and started to present the meeting slides (ppt).

Volunteer for minutes

Joachim takes the notes.

Approval of agenda

Agenda unanimously approved.

Review and approve minutes from last meeting

The minutes of the May 14 and July 9, 2012 meetings were approved.

Examples and experiences using TDM functionality

Examples can be found in the slides. The examples base on a VHDL 2002 compatible version of the TDM function. There was a discussion on the subsequent topics

  • There is no advantage of introducing a type REAL_MATRIX instead of a type REAL_VECTOR_ARRAY
    for the description of data in the multidimensional case (concerns also code based on VHDL 2002).
  • It should pecified in more detail how to handle white-space characters in data files.
  • Character ' ' as SEPARATOR parameter should also bes used for other white space characters (HT, ...).
  • CSV handling should only base on given real values per data line. Function parameters point to columns. Thus, _SELECTROR in associated parameter identifier sholud be replaced by -COLUMN.
  • Only data point information should be extracted from IBIS files. The details must be better specified.
  • Data files might be very hudge (65000 data lines and more). This may lead to inefficiencies if only constrained arrays (as in VHDL 2002) can be used in record declarations.

Decision on how to continue

The subsequent problems remain

  • Hiding in the package header TABLE_INTERPOLATION_PKG the declaration of
  • Allow additional declarations only for the reference implementation, e.g.
    type REAL_VECTOR_ARRAY is array (NATURAL range <>) of REAL_VECTOR;
  • Declaration of function interfaces to handle [TDM-R14}
    • IBIS files
    • Excel CSV files
  • Final documents with the results of the activities of this subcommittee

Next meeting

Tuesday, November 11, 2012 at 8am PDT or 17:00 CEST. It must be checked whether this is a suitable date.




The meeting was closed at 18:00 CEST. An invitation will be sent out for the next meeting.

Action items


  • Check on how to hide record declarations for TABLE_DATA_REAL and TABLE_DATA_COMPLEX in the package header.


  • Proposal for handling white space charcters in files.
  • Specification of PREPARE_DATA_FUNCTIONS for CSV and IBIS files.
Topic revision: r2 - 2016-01-24 - 02:42:56 - ErnstChristen
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