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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 info@ibis.org.

A list of reported bugs is maintained at http://ibis.org/bugs/ibischk/ .

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PARSER VERSION NUMBER: 6.1.4

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

OS AND VERSION: All

REPORTED BY: Lance Wang, IO Methodology; Mike LeBonte, SiSoft; 
   Bob Ross, Teraspeed Labs

DATE: June 26, 2018

DESCRIPTION OF BUG:
No message for 0 or less for Delta in IBIS-AM. Version IBIS 6.1 Specification
prohibits <delta> less or equal to 0.0., The AMI parameter Type Increment
and Steps are defined as:

  Increment <typ> <min> <max> <delta> where min <= typ <= max and delta is
  always positive. After expansion, the expanded values of the parameter are
  typ + N*delta where N is any positive or negative integer value provided by
  the EDA tool during the expansion process so that:  min <= expanded values
  <= max

  Steps <typ> <min> <max> <# steps> Treat exactly like Increment with
  <delta> == (<max>-<min>)/<# steps>

However, with IBISCHK 6.1.4, when <delta> or <# steps> is equal to 0, the
IBISCHK doesn’t give any ERRORS or WARNINGS.

The degenerate case is permitted where <min> = <typ> = <max>, but the Increment
and Step functions can still work with one iteration.  This report does not
suggest checking for the degenerate cases since the Specification does not
provide rules or suggestions.

However, the Increment value <delta> =< 0.0 should be reported as an Error
because this is a specification violation.

For Steps, a value of <# steps> <= 0.0 should be reported as a Warning
because the value was intended to be positive value where the sign of N
controls the stepping direction. 

============================================================================

INSERT IBIS FILE DEMONSTRATING THE BUG:

| ********************* IBS File <bug197.ibs> ********************

[IBIS Ver]      6.1
[File Name]     bug197.ibs
[Date]          May 17, 2018
[File Rev]      0.1
|
[Component]     BUG197
[Manufacturer]  IO Methodology Inc. Test Model
[Package]
R_pkg        0.001m  NA  NA
L_pkg        0.001nH  NA  NA
C_pkg        0.001pF  NA  NA
|
[Pin] signal_name model_name R_pin L_pin C_pin
  11   BUG197_P   BUG197_RX  NA NA NA 
  12   BUG197_N   BUG197_RX  NA NA NA
|
[Diff Pin] inv_pin  vdiff tdelay_typ tdelay_min tdelay_max
     11      12     0   NA   NA   NA
|
|***************************
|
[Model]    BUG197_RX
Model_type Input
C_comp  0.0 0.0 0.0
Vinl = .5
Vinh = .5
[Voltage Range] 1.0 1.0 1.0
|
[Algorithmic Model]
Executable Windows_VisualStudio15.2_32   icg_32.dll   bug197.ami
Executable Windows_VisualStudio15.2_64  icg_64.dll   bug197.ami
Executable Linux_gcc4.1_32              icg_32.so    bug197.ami
Executable Linux_gcc4.1_64              icg_64.so    bug197.ami
[End Algorithmic Model]
|   
[End]

| ********************* AMI File <bug197.ami> ********************

(bug197_rx 

  (Reserved_Parameters
    (Init_Returns_Impulse (Usage Info) (Type Boolean) (Default True))
    (GetWave_Exists (Usage Info) (Type Boolean) (Default True))
    (Use_Init_Output (Usage Info) (Type Boolean) (Default True))
  ) | End Reserved_Parameters

  (Model_Specific
    (TestIncrement (Usage In)(Increment 1.0 0.0 2.0 0.0)(Type Float))
    (TestSteps (Usage In)(Steps 1.0 0.0 2.0 0)(Type Float)) 
  ) | End Model_Specific
) | End

| ******** Use Executable Files from Previous Test Cases ********
 
icg_32.dll
icg_32.so
icg_64.dll
icg_64.so


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******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
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BUG NUMBER:                                                 197

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

PRIORITY: [HIGH, MEDIUM, LOW]                               LOW

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

FIXED VERSION:  6.1.5

FIXED DATE:    December 21, 2018 


NOTES ON BUG FIX:
Processed at the IBIS Open Forum Meeting on June 29, 2018.
To be fixed in a future release.

--- checked ok for bug197.ami
E4659 reported for Increment Delta (0.0)
W4659 reported for Steps #steps (0)

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