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

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/.

******************************************************************************

PARSER VERSION NUMBER: 6.1.4

PLATFORM (SPARC, HP700, PC, etc.): PC (Intel(R) Core(TM) i5-6440HQ Processor)

OS AND VERSION: Microsoft Windows 10 Enterprise, Version 1607

REPORTED BY: Michael Mirmak, Intel Corp.

DATE: August 29, 2017

DESCRIPTION OF BUG:

The use of the Caution flag with ibischk6 on a file where a single model is used
in both single-ended and differential contexts causes misleading caution messages
to appear. 

Specifically, the parser "determines" any [Model] associated with a pin named under
[Diff Pin] as "Differential", even if that [Model] is also used with pins not listed
under [Diff Pin] and therefore nominally single-ended.  

The problem with this is that pseudo-differential buffers are 
constructed using pairs of single-ended buffers with opposing stimuli.  Therefore,
single-ended buffers and (pseudo-)differential buffers mentioned under [Diff Pin] 
may both refer to the same [Model], with equal precedence.  

Michael Mirmak and the IBIS Quality TG on September 5, 2017 suggested this modified
message:

C0611 - Pin 1 is not referenced as a [Diff Pin] though the associated Model Input1 is 
referenced by a [Diff Pin]

The output of the demonstration file with -caution is as follows:

IBISCHK6 V6.1.4

Checking bug192.ibs for IBIS 3.2 Compatibility...

C0611 - Pin 1 is not defined as a Diff Pin though the associated Model Input1 was determined to be Differential
Errors  : 0
Cautions: 1

File Passed


INSERT IBIS FILE DEMONSTRATING THE BUG:

|*******************************************************
[IBIS Ver]      3.2
[File Name]     bug192.ibs
[File Rev]      1.0
[Date]          August 29, 2017
[Source]        From Michael Mirmak, Intel Corp.
|
|*******************************************************
|
[Component]     BUG192
[Manufacturer]  XYZ, Inc.
|
|*******************************************************
[Package]
  R_pkg          1.e-03      NA           NA           
  L_pkg          1.e-09      NA           NA           
  C_pkg          1.e-12      NA           NA           
|
[Pin]    signal_name    model_name        R_pin      L_pin      C_pin
1        Test_SE           Input1
2        Test_P            Input1
3        Test_N            Input1
|
[Diff Pin]  inv_pin vdiff tdelay_typ  tdelay_min  tdelay_max
2              3      0.8  NA NA NA
|
|*******************************************************
|
[Model]         Input1
Model_type      Input
Vinl = 0.65V
Vinh = 1.15V
C_comp               1.0pF             NA             NA
|
[Voltage Range]      1.8V              NA             NA
|
|*******************************************************
|
[End]


******************************************************************************
******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
******************************************************************************

BUG NUMBER:                                                 192

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:
Classified at the September 15, 2017 IBIS Open Forum Meeting after refinement
of the suggested message. To be fixed in a future release

Caution message text for C0611 and C0609 modified per the suggestion in this
report.


******************************************************************************
******************************************************************************