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

From: Akhilesh CHANDRA <akhilesh.chandra_at_.....>
Date: Tue May 15 2007 - 02:38:21 PDT
Hello Anguraj,

  thanx for this info. I will check this.

Regards
Akhilesh 

-----Original Message-----
From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf
Of Anguraj K
Sent: Tuesday, May 15, 2007 2:55 PM
To: Akhilesh CHANDRA
Cc: 'Dunbar, Tony'; ibis@server.eda-stds.org
Subject: Re: [IBIS] How we can model startup time in IBIS.

Hello Akhilesh,
I went through all the e-mail trail related to this subject.

I believe you can use driver schedule to give the start time like this.
Having only one model defined in the driver schedule and giving suitable
delays needed as below.

[Driver Schedule] |
 Model_Name Rise_on_dly Rise_off_dly Fall_on_dly Fall_off_dly
 |model_name          3ns                X         3ns                    X

Pls refer to the cookbook to cook this spicy!

Hope this suits your need!

Thanks,
Anguraj

Akhilesh CHANDRA wrote:

>Hello Tony,
>
>  Thanx for your reply. Initial delay is not important for SI 
>simulations but if it's missing in our model then it's difficult to 
>match spice and IBIS results also few customers  use these models for 
>delay calculation if I don't support this startup time then customer 
>have only 300ps delay while in silicon it's 3.3ns.
>
>Regards
>Akhilesh
>
>-----Original Message-----
>From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On 
>Behalf Of Dunbar, Tony
>Sent: Monday, May 14, 2007 10:22 PM
>To: ibis@server.eda-stds.org
>Subject: RE: [IBIS] How we can model startup time in IBIS.
>
>Hi Akhilesh,
>
>I've pondered this for a little while and all I can come up with is to 
>ask why is this an important or even relevant functional detail to be 
>included in a signal integrity simulation, presuming it is a signal 
>integrity simulation you are wanting to do?
>
>An "initial delay" can be incorporated into the stimulus of some SI 
>simulators but that is really intended to provide for driver-to-driver 
>skew, whereas your brief description refers to "startup".
>
>Regards,
>Tony
>
>-----Original Message-----
>From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On 
>Behalf Of Akhilesh CHANDRA
>Sent: Monday, May 14, 2007 4:18 AM
>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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Received on Tue May 15 03:31:23 2007

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