RE: [IBIS-Users] pull-up/down and schmitt trigger modeling issue

Subject: RE: [IBIS-Users] pull-up/down and schmitt trigger modeling issue
From: Tom Dagostino (tom@teraspeed.com)
Date: Fri Mar 28 2003 - 14:22:33 PST

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You can accommodate the resistive (?) pullup or pulldown in a tri-stated
buffer by placing that resistive characteristic in the power or ground clamp
table.

For the input you can use a model selector to have the user select between
an input with normal vin/vinh and an input with the schmitt characteristics
specified in the model spec section.

Tom Dagostino
Teraspeed Consulting Group LLC Teraspeed Consulting Group LLC
2926 SE Yamhill St. Device Modeling Division
Portland, OR 97214 13610 SW Harness Lane
Beaverton, OR 97008
http://www.teraspeed.com 503-430-1065
tom@teraspeed.com

-----Original Message-----
From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of Eric Hsu
Sent: Friday, March 28, 2003 1:43 PM
To: tom@teraspeed.com
Cc: ibis-users@server.eda.org
Subject: RE: [IBIS-Users] pull-up/down and schmitt trigger modeling
issue

Hi Tom,

Thanks for answering. Maybe I didn't describe question clearly. The
pull-up/down case I mean is under buffer be tristate condition, pad might be
needed to pull-up/down weakly.
As for schmitt trigger input buffer, does ibis spec. allow input buffer with
and without schmitt trigger (if it could be enable/disable) feature in one
single model? which mean it could be defined Vinh/Vinl (disable case) and
Vinh+,Vinh-/Vinl+,Vinl- (enable case) together?

Best Regards,

Eric Hsu
Interface Technologies
NetLogic Microsystems Inc.
450 National Ave.
Mountain View, CA 94043
650-961-6676 x198

-----Original Message-----
From: Tom Dagostino [mailto:tom@teraspeed.com]
Sent: Friday, March 28, 2003 1:25 PM
To: Eric Hsu
Subject: RE: [IBIS-Users] pull-up/down and schmitt trigger modeling
issue

Eric

IBIS assumes for the Output, Tri-state and I/O buffer that both pullup and
pulldown are present. If not the open sink or open source buffer types are
used. ECL has its own buffer type.

Input with schmitt trigger characteristics can be specified in the Model
Spec section.

-----Original Message-----
From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of Eric Hsu
Sent: Friday, March 28, 2003 11:27 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] pull-up/down and schmitt trigger modeling issue

Hi,

In the IBIS spec., is there any key word designed for output buffer if it
have pullup/pulldown feature? also the same question for input buffer with
schmitt trigger option?

Best Regards,

Eric Hsu
Interface Technologies
NetLogic Microsystems Inc.
450 National Ave.
Mountain View, CA 94043
650-961-6676 x198

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Next message: rrwolff: "[IBIS-Users] [IBIS] Open forum minutes (03/28/03)"
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