Subject: [IBIS-Users] On IBIS Model Generation
From: Angulo, John (john_angulo@mentorg.com)
Date: Wed Sep 18 2002 - 11:26:35 PDT
The following is posted on behalf of Eckhard Lenski at Siemens. Please send all private replies to eckhard.lenski@siemens.com only.
-----------------------------------
Hello Jairam,
when you extract your v-i-curves, there must not be any package parasitics during that measurement (or simulation ) ( and the same is valid for the v-t-curves )
You usually switch the outputbuffer in the logical high / or low state and than you sweep the outputvoltage source between -vcc up to 2*vcc and you measure the resulting current from the output.
and please have a look at the accuracy handbook on the following web page
http://www.eda.org/pub/ibis/accuracy/
Regards
Eckhard
Eckhard Lenski
Siemens AG
ICN WN OP TDC TC3
Phone : 0049 89 722 27776
Fax : 0049 89 722 44692
Email : eckhard.lenski@siemens.com
-----Ursprungliche Nachricht-----
Von: S Jairam [mailto:sjairam@ti.com]
Gesendet: Dienstag, 17. September 2002 08:48
An: Mohan, Prabhu
Cc: ibis-users@eda.org
Betreff: RE: [IBIS-Users] On IBIS Model Generation
Hi Prabhu,
Thanks for the answer. However the flavour of the question still
remains the same. The buffer drive will depend on the load (might not
just be the package load) that will be hooked up. Should not this
again be varied for generating the IBIS model ?
Thanks and Regards,
Jairam.
Mohan, Prabhu writes:
#Hi Jairam,
#
#The package parameters (RLC) are NOT taken into account while generating the
#IBIS model. They are to be provided seperately to facilitate simulation
#using other (SI) tools.
#
#Ragards
#Prabhu/~
#
#-----Original Message-----
#From: S Jairam [mailto:sjairam@ti.com]
#Sent: Monday, September 16, 2002 10:07 PM
#To: ibis-users@eda.org
#Subject: [IBIS-Users] On IBIS Model Generation
#
#
#
#Hi,
#
# This might sound very dumb a question, but I dont have an
#answer to this.
#
# When IBIS model generation for an IO buffer is in progress,
#only one package load (a set of RLC parameters) is used to calculate
#all the IV curves. Is that valid ? Because in such a case the
#I-V curves of buffer would then be dependent of the package load.
#
# Shouldn't it be that the calculation be done for various load
#points with each load-point providing a set of I-V curves.
#
#Please correct me if I am wrong.
#
#Thanks and Regards,
#Jairam.
#--
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