Subject: [IBIS-Users] Driver schedule interpretation.
From: Angulo, John (john_angulo@mentorg.com)
Date: Thu Jan 29 2004 - 19:00:24 PST
The following is posted on behalf of Itzik Peleg at Marvell. Please send any private replies to itzikpe@il.marvell.com.
-----------------------------------
Hello IBIS Users
This question regarding the interpretation of driver schedule keyword.
I have made a model using driver schedule keyword. the model is working
fine using one simulation tool.
and don't working (give a completely massy weave form) in another
simulation tool.
When applying to the simulation tool vendor to get his response (and
after some more emails).
I realize that the driver schedule is interpreted differently in the two
simulations tool.
The major difference can be summarize by this question:
When using the [Driver schedule] keyword for example:
[Driver Schedule]
|
| Model name Rise_on_dly Rise_off_dly Fall_on_dly Fall_off_dly
Out_model 0n 10n NA NA
When the stimulus start rising the model is activated (the pullup of
Out_mode get to on state etc')
If 5ns after the rising of the stimulus, the stimulus have a falling edge.
Here is the question: What will happen 1 or 2 ?
1. The pullup of Out_model will get into off state (turn off) at 5ns
since the stimulus is falling .
at 10ns nothing will happen since the pullup is in off state
(the rise_off_dly has been canceled by the falling stimulus).
2 The pullup of Out_model will stay in on state (turn on) at 5ns.
at 10ns the pullup of Out_model will go into off state since the
Rise_off_dly time has come.
(the rise_off_dly isn't canceled by the falling stimulus).
I want an answer by the IBIS committee which will guide how this keyword
should be interpreted in order
that the model maker can make models that will be interrupted correctly
by the EDA tools vendors.
Regards
Itzik Peleg
Board Technology Group
Marvell Semiconductor Israel Ltd
Moshav Manof, D.N. Misgav 20184, ISRAEL
Email - itzik.peleg@il.marvell.com
Tel - +972 4 9951192
Cell - +972 54 452482
Fax - +972 4 9951902
WWW Page: http://www.marvell.com
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