RE: [IBIS-Users] IBIS Question

Hi vivek,
       Thanks for the earliest response.
1) I cheked with IBISCHK4 it did not report even warning for this [Rgnd]
of 52kohm ,and for another model also [Rgnd] is used as 600Kohm same is
case. But our problem is we sent the model to our customer and they are
using ICX I don't know which version but it is reporting "Bad Numerical
Value". Is this problem with [Rgnd] key word or with "ohm" which I used
after 52K.

2)If I make version 4.0 it will not show the all Non-monotonic warnings
but ICX does not support 4.0 Version because of this constraint I had
give ibis model with 3.2 to my customer.

3)for [Model Selector] is supported by the ICX, if so which versions
will allow this feature.

Best Regards
Kiran Kumar

-----Original Message-----
From: Vivek Kumar Sundriyal [mailto:Vivek.Kumar.Sundriyal@nsc.com]
Sent: Thursday, July 28, 2005 10:41 AM
To: Seshadri KiranKumar (WT01 - EMBEDDED & PRODUCT ENGINEERING
SOLUTIONS)
Subject: RE: [IBIS-Users] IBIS Question

Hi Kiran ,

For 1) If the R-pkg values are more than 50KOhm, IBISCheck gives a
warning (
only if the IBIS version is 4.0) that the range of R-pkg is 0 to 50K. I
dont
know if the same case exists with  [Rgnd]. You can probably give it a
try.

For 2) To cross-check on the non-monotonic warning, make your IBIS
Version to
4.0 and then try ibschk4 again. What is important is the summation of
the Pullup
and Powerclamp and the pulldown and gndclamp. This summation should be
monotonic. If your IBIS version is made 4.0,IBISCHK4 checks for this
summation.
And if the summation is monotonic, you wont get warning errors.

For sure for the error 3.

Cheers ,

Vivek





                      seshadri.kirankuma

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                      owner-ibis-users@e        cc:

                      da.org                    Subject:  RE:
[IBIS-Users] IBIS Question





                      07/27/05 08:19 PM









Hi ,

    I have some problem with IBIS model that I had delivered to my
customer. I
have attached REPORT file listing all Errors that ICX tool parsed. There
you can
find 3 kinds of warnings as follows:

1) ;;Error :  at line 3991 in file txt05668.ibs : Bad numerical value
52Kohm
found.
    This is because in this component few of models using [Rgnd] key
word as
follows

[Rgnd]          52kohm             NA   NA

i am feeling this Error is because of "ohm" . If I am correct why it is
not
showing atleast warning in IBISCHK4 case.

2) ;;Error :  at line 4438 in file txt05668.ibs : Messages for model
BT0005_MODE0:
;;    ;;    Error: The sum of the typical clamp curves is not monotonic
at
voltage 1.78.
;;    ;;    Error: The sum of the maximum clamp curves is not monotonic
at
voltage 1.87.

IBISCHK4 lists as a Non-monotonicity warnings where as ICX listing them
as
Errors.
   It would help me lot if you mention how to silence these warnings.

3) ;;Warning :  at line 5316 in file txt05668.ibs : Pin model
BT0005_MODE0
referred to by the selector BT0005_MODE does not exist in this file.
Ignoring
this selection.

This I have mentioned Model selector key word option as follows

[Model Selector]  BT0005_MODE
BT0005_MODE0      Buffer oprating at 1.8V
BT0005_MODE1      Buffer oprating at 2.75V
BT0005_MODE2      Buffer oprating at 3.3V

As far IBIS since it is proper definition it is not listing where as it
is not
recognizing by ICX tool

Kindly help me by providing proper solution for above problems.

     Thanks in advance for your valuable support.

Best Regards
Kiran Kumar














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