RE: [IBIS] How we can model startup time in IBIS.

Hello Itzik,

If I remove it from my VT table then I can run the design at 800MHZ but then
I have mismatch in IBIS and spice results. In this case my spice have 3ns
startup time but it's missing in IBIS models.

Regards
Akhilesh 

-----Original Message-----
From: Itzhak Peleg [mailto:itzikpe@marvell.com] 
Sent: Monday, May 14, 2007 3:44 PM
To: Akhilesh CHANDRA; ibis@eda-stds.org
Subject: RE: [IBIS] How we can model startup time in IBIS.

Hi Akhliesh

You can you remove the same lead time in all curves.
For example removing 3ns from each curve subtracting the new 1st time point
from each time point (so the curve will start at 0ns time). Then write the
curves to the IBIS model.

--
Regards
 
Itzik Peleg
Board Technology Group
 
Marvell Semiconductor Israel Ltd
6 Hamada Street
Mordot HaCarmel Industrial Park
Yokneam 20692, ISRAEL
 
Email - itzikpe@marvell.com
Tel   - +972 4  9091192
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Fax   - +972 4  9091501
WWW Page: http://www.marvell.com
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-----Original Message-----
From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf
Of Akhilesh CHANDRA
Sent: Monday, May 14, 2007 12:18 PM
To: ibis@server.eda-stds.org
Cc: Akhilesh CHANDRA
Subject: [IBIS] How we can model startup time in IBIS.

 

Hello Experts,

  I am doing IBIS model of an IO operating at 800MHZ frequency. It have
startup time of 3nsec. After 3ns design gives output of 800mhz frequency. If
I model this time in waveform database of IBIS models the I have over
clocking issue and design is not work at this high frequency. Can you help
me to model this startup time. Is anyone make IBIS model of such designs.

Regards
Akhilesh


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