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********************* IBIS GOLDEN PARSER BUG REPORT FORM *********************
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INSTRUCTIONS

To report a bug in the IBIS golden parser.  Please fill out the top part
of the following form and send the complete form to ibischk-bug@vhdl.org.

A list of reported bugs will be maintained on vhdl.org.

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PARSER VERSION NUMBER: 3.2.5

PLATFORM (SPARC, HP700, PC, etc.): HP

OS AND VERSION: HP_UX (B.10.20)

REPORTED BY: Michael Mirmak, Intel Corp.

DATE: November 8, 2000

DESCRIPTION OF BUG:

Section 9 of the IBIS 3.2 specification, under "Notes on Data Derivation
Method,"
describes the proper assignment of values to "min" and "max" data columns:

     "The 'min' and 'max' columns for all remaining keywords and 
     subparameters will contain the smallest and largest magnitude
     values.  This applies to the [Model] subparameter C_comp as 
     well..."
 
Currently, the parser does not generate any message to the user when the 
numerically-largest C_comp value appears under the "min" data column.
Similarly, no error is flagged when the numerically-smallest C_comp value
appears under the "max" data column.  Currently, several vendors' own 
IBIS converters flag this mis-ordering as an error.  As many tool vendors 
allow the user to map any C_comp value to any device corner, independently 
of VT and IV curve data, strict numerical ordering of C_comp should be
enforced.

Some indication -- most appropriately, an error -- should be made by the
parser of the incorrect ordering of C_comp values.

An example:

  ERROR (line  xxx) - A model's "min" C_comp must be the smallest 
  value listed while "max" C_comp must be the largest value listed. 

This bug also applies to DOS32 IBISCHK3 v3.2.5.

INSERT IBIS FILE DEMONSTRATING THE BUG:
|
|***********************************************************************
|
[IBIS Ver]       3.2
[File Name]      bug50tst.ibs
[File Rev]       0.0
[Date]           08-November-2000
[Source]         File created from specification
|
[Disclaimer]
    (C) Copyright 2000 Intel Corp.
    All rights reserved
    This model is for demonstration purposes only.
|
|
[Component]      GENERIC_IBIS
[Manufacturer]   Intel Corp.
|
[Package]
|                typ        min        max
R_pkg            6.0mO      5.0mO      7.0mO
L_pkg            5.0nH      2.0nH      8.0nH
C_pkg            1.0pF      0.5pF      1.5pF
|
|
[Pin]     signal_name        model_name    R_pin    L_pin    C_pin
    A1     TestSignal1       TestModel          
|
|************************************************************************
|
[Model]          TestModel
Model_type       Output
Polarity         Non-Inverting
Cref = 10.0pF
C_comp                    5.00pF            40.00pF            1.00pF
|
|
[Temperature Range]       27.00             100.00            0.00
[Voltage Range]           3.30V             3.00V             3.60V
[Pulldown]
| voltage     I(typ)              I(min)              I(max)
|
  -3.3000      -20.0A           -25.00A             -15.00A
   0.0000       0.0A            -5.00nA              5.00nA
   3.3000       40.00mA          32.00mA             48.00mA 
   6.6000       10.0A            12.0A                8.00A
|
[Pullup]
| voltage     I(typ)              I(min)              I(max)
|
  -3.3000       10.00A              12.00A              8.00A
   0.0000        0.0uA             -0.30uA              0.30uA
   3.3000      -65.00mA            -40.00mA            -80.00mA
   6.6000      -22.00A             -25.00A             -19.00A
|
[Ramp]
| variable       typ                 min                 max
dV/dt_r          0.35/1.6n        0.25/1.8n            0.45/1.5n
dV/dt_f          0.35/1.6n        0.25/1.8n            0.45/1.5n
R_load = 50.000
|
|***************************************************************************
|
[End]
|
|
|
|Parser 3.2.5 responds with
|
|IBISCHK3 V3.2.5
|
|Checking bug50tst.ibs for IBIS 3.2 Compatibility...
|
|Errors  : 0
|
|File Passed       
|
******************************************************************************
******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
******************************************************************************

BUG NUMBER:  50

SEVERITY: [FATAL, SEVERE, MODERATE, ANNOYING, ENHANCEMENT]  ANNOYING

PRIORITY: [HIGH, MEDIUM, LOW]                               LOW

STATUS: [OPEN, CLOSED, WILL NOT FIX, NOT A BUG]             CLOSED

FIXED VERSION:  Version 3.2.8

FIXED DATE:     November 20, 2001

NOTES ON BUG FIX: Classified at the November 17, 2000 IBIS Meeting.  BUG50
                  is planned to be fixed in a future ibischk3 release.


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