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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: 6.1.5

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

OS AND VERSION:	All

REPORTED BY: Lance Wang - Zuken USA

DATE:	April 1, 2019

DESCRIPTION OF BUG:
IBISCHK checks C_comp and C_comp_* whether one of them exists. However, the
scenario is that ibischk doesn't report anything if Input type model has
C_comp_pullup and/or C_comp_pulldown. Or even only have C_comp_pullup and/or
C_comp_pulldown is present. 

The suggestion to have an Enhancement to give a Caution, Warning, or Note for
this kind of scenario to question if the subparameters were what were
intended.  (A Caution message was selected.)

Note, the Enhancement would also apply to the content under [C Comp Corner]
(shown in the test case) and to all Input_* types and Terminator models.  The
Specification does not prohibit these cases.

Also note that Series Model_types ignore any C_comp entries.  So no further
reporting is needed.

INSERT IBIS FILE DEMONSTRATING THE BUG:

[IBIS Ver]      5.1
[File name]     bug203.ibs
[File Rev]      1.00
[Date]          April 1, 2019
[Source]        Test ibis file for C_Comp_* IBISCHK Message  
| 
[Notes]         
| -------------------------------------------------------------------------- 
|  
[Component]    BUG203 
[Manufacturer]  Lance Wang 
|
[Package]
|        typ       min       max
R_pkg    1211.54m  330.19m   2095.79m 
L_pkg    3.06nH    1.62nH    4.54nH   
C_pkg    2.13pF    1.42pF    2.76pF   
|
[Pin] signal_name          model_name           R_pin     L_pin     C_pin
A1    test_input           BUG203_IN1
A2    test_input           BUG203_IN2  | With [C Comp Corner]
 

[Model]         BUG203_IN1
Model_type      Input
Vinl  =         0.540V
Vinh  =         0.720V
|
| variable              typ        min        max
| C_comp                  1.269pF    1.268pF    1.269pF 
|
C_comp_pullup           0.9pF      0.8pF      1.0pF
C_comp_pulldown         0.9pF      0.8pF      1.0pF
| C_comp_power_clamp      0.9pF      0.8pF      1.0pF
| C_comp_gnd_clamp        0.9pF      0.8pF      1.0pF
|
| variable              typ        min        max
[Voltage Range]         1.800V     1.700V     1.900V 
|
| variable              typ        min        max
[POWER Clamp Reference] 1.800V     1.700V     1.900V 
|
| variable              typ        min        max
[GND Clamp Reference]   0.000V     0.000V     0.000V 
|
[Model]         BUG203_IN2
Model_type      Input
Vinl  =         0.540V
Vinh  =         0.720V
|
| variable              typ        min        max
| C_comp                  1.269pF    1.268pF    1.269pF
C_comp_pullup           0.9pF      0.8pF      1.0pF
C_comp_pulldown         0.9pF      0.8pF      1.0pF
 
|
[C Comp Corner]
|
C_comp_pullup           0.9pF      0.8pF      1.0pF
C_comp_pulldown         0.9pF      0.8pF      1.0pF
| C_comp_power_clamp      0.9pF      0.8pF      1.0pF
| C_comp_gnd_clamp        0.9pF      0.8pF      1.0pF
|
| variable              typ        min        max
[Voltage Range]         1.800V     1.700V     1.900V 
|
| variable              typ        min        max
[POWER Clamp Reference] 1.800V     1.700V     1.900V 
|
| variable              typ        min        max
[GND Clamp Reference]   0.000V     0.000V     0.000V 
|
[End]


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******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
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BUG NUMBER:           203

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

PRIORITY: [HIGH, MEDIUM, LOW]                              LOW

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

FIXED VERSION:  7.0.2

FIXED DATE:     August 3, 2020

NOTES ON BUG FIX:
Introduced and discussed April 5, 2019. Classification and recommended
resolution deferred until further discussion in the ATM task group.

Discussed and classified at the May 17, 2019 IBIS Open Forum meeting.  The
suggested fix is to issue a Caution message for the above conditions.  A
Warning message was considered as being too strong.  A Note message was
considered but Note messages are used mostly for non-monotonic I-V tables.
A Caution message is used for suspicious values or syntax (to notify the
model developer or user), but whose conditions are technically valid.  So
a Caution message for BUG203 seems appropriate.

To be fixed in a future release.

August 3, 2020 - Checks ok.  Additional Caution messages added for certain
Open* models where C_comp_pullup or C_comp_pulldown are provided, but there
are not corresponding I-V [Pullup] or [Pulldown] tables.  This is NOT
technically wrong, but informs the modeler that a C_comp might have been
added.  Three cases are checked with 3 new Caution messages.

The resolution of BUG203 is expanded to include other checks:

ibischk7      Version 7.0.1 Version 7.0.2

bug203         0 Cautions    3 Cautions
bug203all-1    0 Cautions   24 Cautions - (All Model_types with all C_comp*)
bug203all-2   21 Errors     21 Errors (No C_comp added - ok)
bug203all-3   19 Warnings   38 Warnings (C_comp and C_comp* specified)

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