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

True, but then the simulated output won't model the 3ns startup time,
because the data will have been stripped from the V-T curves.

The short answer to the original question is that IBIS models output
switching behavior based on certain assumptions.  In my opinion, modeling a
3ns startup time with a 800 MHz signal isn't possible.

IBIS models the device's dynamic behavior - if the 3ns startup only occurs
once (at device powerup, while the rest of the system is initializing), why
is modeling it important?

Todd.

Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA  01754
(978) 461-0449 x24
twesterh@sisoft.com
www.sisoft.com
-----Original Message-----
From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Yasser
Sabry
Sent: Monday, May 14, 2007 7:52 AM
To: Akhilesh CHANDRA
Cc: 'Arai, Tadashi'; ibis@eda-stds.org
Subject: Re: [IBIS] How we can model startup time in IBIS.

Hi Akhilesh,

    In HyperLynx, there is an advanced option (options-> 
preferences->advanced) called "Strip V-t non-switching time". Check it 
and it will remove the dead time


Akhilesh CHANDRA wrote:

>Hello Arai,
>
>  Could you please tell me which simulator can do this. I am using
>HYPERLYNX, HSPICE and ELDO to validate the models and I don't know if we
can
>do this by these simulator.
>
>Regards
>Akhilesh 
>
>-----Original Message-----
>From: Arai, Tadashi [mailto:tadashi.arai@amd.com] 
>Sent: Monday, May 14, 2007 3:19 PM
>To: Akhilesh CHANDRA; ibis@eda-stds.org
>Subject: RE: [IBIS] How we can model startup time in IBIS.
>
>Hi,
>
>Initial delay time of stimulus can be configured in simulator, not in IBIS
>model. I know some simulator can support user stimulus.
>
>Regards,
>
>----
>Tadashi ARAI / MTS Application Engineer Hardware Support Engineering,
>Customer Support Services Japan Engineering Lab., AMD Japan Limited 
>+81-3-3346-7687 / +81-3-3342-5196 (fax)
>
>
>-----Original Message-----
>From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of
>Akhilesh CHANDRA
>Sent: Monday, May 14, 2007 6:18 PM
>To: ibis@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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-- 

Thank you and Best Regards,
Yasser Sabry

-------------------------------------------
Yasser Mohammed Sabry
Device Modeling Team  
Analog/Mixed Signal - DSM Division
Mentor Graphics Egypt
Tel: (+202) 416 3613
Mob: (+2010) 1834833
Fax: (+202) 418 6945
E-mail: yasser_sabry@mentor.com
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