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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 ibischk-bug@vhdl.org.

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

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PARSER VERSION NUMBER: 2.1.14 

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

OS AND VERSION: ALL

REPORTED BY: Chris Rokusek, Viewlogic

DATE: April 24, 1998

DESCRIPTION OF BUG: Floating-point precision in routine acdc_VI_Given_VIC_VR(...)

For test case below when the intersection of a load line occurs exactly at a
particular VI segment endpoint it is possible the segment searching loop
will miss it due to floating-point precision.

Propose adding a voltage tolerance of 1uV is allowed.  This covers the
case below by > 100000X orders of magnitude and is > 1000X accuracy
required.  Recall this is only a check and does not affect simulators
accuracy/use of this data.

#define ACDC_VI_GIVEN_VIC_VR_VTOL .1E-06		    /* .1uV */

I have modified acdc.c to handle this situation and will send updates
to Matthew Flora.  -Chris


INSERT IBIS FILE DEMONSTRATING THE BUG:

[IBIS Ver]  2.1
[File Name] fp.ibs
[File Rev]  1.0
[Date]      Fri Mar 27 11:24:04 1998
[Source]    IBIS_BUG
|
[Component]     comp
[Manufacturer]  fake
[Package]
|
| variable       typ        min       max
R_pkg            122.90m    NA        NA
L_pkg            10.33nH   NA        NA
C_pkg            0.82pF   NA        NA
|
[Pin] signal_name    model_name                       R_pin L_pin  C_pin
1     sig            flt_prec_out                     122.90m 10.33nH  0.82pF
2     VCC            POWER                          122.90m 10.33nH  0.82pF
3     GND            GND                            122.90m 10.33nH  0.82pF
|
[Model]     flt_prec_out
Model_type   Output
|
Vmeas = 1.5000
Cref = 5.00e-11
Rref = 50
Vref = 3.3
C_comp      0.5900pF   NA      NA
|
|
[Temperature Range]   50.00            50.0           50.0
[Voltage Range]        3.3000           3.0000              3.6000
[Pulldown]
| voltage            I(typ)        I(min)          I(max)
-0.00                0 0 0
 3.60                .500 .500 .500
|
[Pullup]
| voltage            I(typ)        I(min)          I(max)
 8.30               -2.00e-04       -2.00e-04       -3.00e-04
 0.21               -5.12e-03       -4.44e-03       -5.46e-03
 0.00                0.00e+00        0.00e+00        0.00e+00
-0.01                2.55e-04        2.23e-04        2.71e-04
-0.58                1.56e-02        1.37e-02        1.63e-02
-1.31                3.00e-04        3.00e-04        2.00e-04
-5.30                3.00e-04        3.00e-04        2.00e-04
|
[Ramp]
dV/dt_r   1.0/.9n 1.0/.9n 1.0/.9n
dV/dt_f   .8/.6n .8/.6n .8/.6n
|
|
|
[GND_Clamp]
|Voltage   I(typ)       I(min)       I(max)
 0.0    -0.00e+00    -0.00e+00    -0.00e+00
  3.22     0.00e+00     0.00e+00     0.00e+00
|
[POWER_Clamp]
|Voltage   I(typ)       I(min)       I(max)
 0.00     0.00e+00     0.00e+00     0.00e+00
 -0.19     0.00e+00     0.00e+00     0.00e+00
 -4.70     3.61e+02     3.61e+02     3.61e+02
 -5.30     3.61e+02     3.91e+02     3.91e+02
[Rising Waveform]
R_fixture = 50.0000
V_fixture = 3.3000
|Time         Typ(v)       Min(v)       Max(v)
0.0000n        0.42    0.42 .42
3.0800n        0.5632     0.5980      0.6271
24.9800n        3.47     3.140000      3.470
|
|
[END]

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

BUG NUMBER: 28

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

PRIORITY: [HIGH, MEDIUM, LOW]                                     MEDIUM
 
STATUS: [OPEN, CLOSED, WILL NOT FIX, NOT A BUG]                   CLOSED

FIXED VERSION: 3.0.2, 2.1.17

FIXED DATE: June 23, 1998, August 13, 1998

NOTES ON BUG FIX:


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