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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 ibis-bug@eda.org.

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

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PARSER VERSION NUMBER: 5.0.3

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

OS AND VERSION: Windows 2000

REPORTED BY: Bob Ross, Teraspeed Consulting Group

DATE: July 5, 2010

DESCRIPTION OF BUG:

Open_drain and Open_source Threshold Test succeeds with ibischk3 Version 3.2,
but Warnings are not detected with ibischk4 (Version 4.2.2) and beyond.  The
last successful test is with ibischk4 Version 4.2.0, and the first failure is
at Version 4.2.1.  The Output tests appear to work correctly.

------
The test file contains two models that give these results:

IBISCHK3, Version 3.2.9 with Correct Message:

Checking bug118.ibs for IBIS 3.2 Compatibility...

WARNING - Model 'BUG118_OS': TYP VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=5V
WARNING - Model 'BUG118_OS': MIN VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=5V
WARNING - Model 'BUG118_OS': MAX VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=5V
WARNING - Model 'BUG118_OD': TYP VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=0V
WARNING - Model 'BUG118_OD': MIN VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=0V
WARNING - Model 'BUG118_OD': MAX VI curves cannot drive through Vmeas=2.5V
          given load Rref=50 Ohms to Vref=0V

Errors  : 0
Warnings: 6

----

IBISCHK4 and IBISCHK5 with incorrect detection.:

IBISCHK4 V4.2.2

Checking bug118.ibs for IBIS 3.2 Compatibility...

Errors  : 0

File Passed

-------

INSERT IBIS FILE DEMONSTRATING THE BUG:

|************************************************************************
|
[IBIS ver]       3.2 | 4.2 | 5.0   | Works for 3.2, fails with 4.2, 5.0
[File name]      bug118.ibs
[File Rev]       0
[Date]           July 5, 2010 
[Source]         Teraspeed Consulting Group
[Notes]          Single I/O 
|
[Component]      BUG118
[Manufacturer]   ABC
[Package]
| variable       typ                 min                 max
R_pkg            0.0000              0.0000              0.0000
L_pkg            0.0000H             0.0000H             0.0000H
C_pkg            0.0000F             0.0000F             0.0000F
|
[Pin]  signal_name          model_name           R_pin     L_pin     C_pin
1      BUG118_OD            BUG118_OD
2      BUG118_OS            BUG118_OS
|
[Model]          BUG118_OD
Model_type       Open_drain
|
Vmeas =   2.5V
Cref = 0.0000F
Rref =  50
Vref =  0            | Bad Vref Not detected after Version 4.2.1
|
C_comp          0 0 0
|
[Voltage Range]           5.000V              4.500V              5.500V
|
[Pulldown]
| voltage     I(typ)              I(min)              I(max)
|
  -5.00000      -100mA              -100mA              -100mA
  10.00000      200mA               200mA               200mA
|
[Ramp]
| variable       typ                 min                 max
dV/dt_r          1.5/1n      1.35/1n  1.65/1n
dV/dt_f          1.5/1n      1.35/1n  1.65/1n
R_load = 50
|
[Rising Waveform]
R_fixture = 50
V_fixture = 5.0
V_fixture_min = 4.5
V_fixture_max = 5.5
| time           V(typ)              V(min)              V(max)
|
0.0       2.5   2.25   2.75
1e-9      5      4.5   5.5
|
[Falling Waveform]
R_fixture = 50
V_fixture = 5.0
V_fixture_min = 4.5
V_fixture_max = 5.5
| time           V(typ)              V(min)              V(max)
|
0.0       5   4.5   5.5
1e-9      2.5 2.25  2.75
|
[Model]          BUG118_OS
Model_type       Open_source
|
Vmeas =   2.5V
Cref = 0.0000F
Rref =  50
Vref =   5V             | Bad Vref Not detected after Version 4.2.1
|
C_comp          0 0 0
|
[Voltage Range]           5.000V              4.500V              5.500V
|
[Pullup]
| voltage     I(typ)              I(min)              I(max)
|
   5.00000      -100mA              -100mA              -100mA
  -10.00000      200mA               200mA               200mA
|
[Ramp]
| variable       typ                 min                 max
dV/dt_r          1.5/1n      1.35/1n  1.65/1n
dV/dt_f          1.5/1n      1.35/1n  1.65/1n
R_load = 50
|
[Rising Waveform]
R_fixture = 50
V_fixture = 0.0
V_fixture_min = 0.0
V_fixture_max = 0.0
| time           V(typ)              V(min)              V(max)
|
0.0     0     0     0
1e-9    2.5   2.25  2.75
|
[Falling Waveform]
R_fixture = 50
V_fixture = 0.0
V_fixture_min = 0.0
V_fixture_max = 0.0
| time           V(typ)              V(min)              V(max)
|
0.0     2.5   2.25  2.75
1e-9       0     0     0
|
[End]

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******************** BELOW FOR ADMINISTRATION AND TRACKING *******************
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BUG NUMBER:  118

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

PRIORITY: [HIGH, MEDIUM, LOW]                               MEDIUM

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

FIXED VERSION:  Version 5.0.4

FIXED DATE:  November 5, 2010

NOTES ON BUG FIX:
   Classified at the IBIS Teleconference meeting on July 9, 2010
   To be fixed in a future release


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