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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 https://urldefense.proofpoint.com/v2/url?u=http-3A__ibis.org_bugs_ibischk_&d=DwIGAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=DcQR-qLpQg5lIreuM6-NYECRIAFXt268PRNS5WO043M&m=vzVjNOlkbRxXVA-Ex-q190H4g6YSgxyBPBe2RLVsh-0A2KH6EMioq9dgKLyTD3P6&s=kCsNPukPzZb01nFMJCUojVm8-nO9xRrOt7Ia1zQhyHw&e=  .

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PARSER VERSION NUMBER:  7.2.1

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

OS AND VERSION:  All

REPORTED BY:  Curtis Clark, Ansys, Inc.

DATE:  June 26, 2025

TITLE:  Incorrectly harsh Warning about mixing C_comp and C_comp_*

DESCRIPTION OF BUG:

The parser issues an incorrectly harsh Warning when C_comp and the C_comp_*
subparameters appear in the same [Model].  For example:

 WARNING - Model Test_Tx: C_comp should not be specified when C_comp_pullup,
 C_comp_pulldown, C_comp_power_clamp or C_comp_gnd_clamp is specified

The specification actually says that it is legal to include both.  IBIS 7.2,
pgs. 61-62, says:

 It is permitted to include the C_comp subparameter together with one or more of
 the remaining C_comp_* subparameters, but in that case the EDA tool will have
 to make a decision whether to use C_comp or the C_comp_pullup, C_comp_pulldown,
 C_comp_power_clamp, and C_comp_gnd_clamp subparameters.

Therefore, the warning message should be demoted to a caution with the new message:

 CAUTION - Model Test_Tx: C_comp is specified along with at least one of the C_comp_* 
 subparameters.  The choice of which to use is left to the EDA tool.

INSERT IBIS FILE DEMONSTRATING THE BUG:
| mymodel.ibs

|
[IBIS Ver]    7.2
[Disclaimer]
              This is an example IBIS file to demonstrate a parser bug.
[File Name]   mymodel.ibs
 
[Date]        June 26, 2025
[File Rev]    1.0

[Source]      Ansys, Inc.
 
[Notes]       This file illustrates a parser bug.
 
[Component]   mymodel_test

[Manufacturer] IBIS_Open_Forum

[Package]
R_pkg          0.00m   NA  NA
L_pkg          0.00nH  NA  NA
C_pkg          0.00pF  NA  NA

[Pin] signal_name   model_name   R_pin L_pin C_pin
   1   Tx           Test_Tx      NA    NA    NA

[Model] Test_Tx
Model_type Output
C_comp     1.0p NA NA
C_comp_power_clamp 0.5p NA NA
C_comp_gnd_clamp 0.5p NA NA
Cref = 0
Vmeas = 0.5

[Temperature Range]  25    100   0
[Voltage Range]      1.00  0.9   1.10

[Pulldown]
-3.3              -0.066           NA              NA
 0.0               0.0             NA              NA
 6.6               0.132           NA              NA

[Pullup]
-3.3               0.066           NA              NA
 0.0               0.0             NA              NA
 6.6              -0.132           NA              NA

[Ramp]
dV/dt_r 0.3/1.5p NA NA
dV/dt_f 0.3/1.5p NA NA

[End]





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******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
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BUG NUMBER: 255

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

PRIORITY: [HIGH, MEDIUM, LOW] MEDIUM

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

FIXED VERSION:

FIXED DATE:

NOTES ON BUG FIX:


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