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 > > >-- >This message has been scanned for viruses and dangerous content by >MailScanner, and is believed to be clean. > >-------------------------------------------------------------------- >|For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org >|with the appropriate command message(s) in the body: >| >| help >| subscribe ibis <optional e-mail address, if different> >| subscribe ibis-users <optional e-mail address, if different> >| unsubscribe ibis <optional e-mail address, if different> >| unsubscribe ibis-users <optional e-mail address, if different> >| >|or e-mail a request to ibis-request@eda-stds.org. >| >|IBIS reflector archives exist under: >| >| http://www.eda-stds.org/pub/ibis/email_archive/ Recent >| http://www.eda-stds.org/pub/ibis/users_archive/ Recent >| http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993 > >-- >This message has been scanned for viruses and dangerous content by >MailScanner, and is believed to be clean. > > >-------------------------------------------------------------------- >|For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org >|with the appropriate command message(s) in the body: >| >| help >| subscribe ibis <optional e-mail address, if different> >| subscribe ibis-users <optional e-mail address, if different> >| unsubscribe ibis <optional e-mail address, if different> >| unsubscribe ibis-users <optional e-mail address, if different> >| >|or e-mail a request to ibis-request@eda-stds.org. >| >|IBIS reflector archives exist under: >| >| http://www.eda-stds.org/pub/ibis/email_archive/ Recent >| http://www.eda-stds.org/pub/ibis/users_archive/ Recent >| http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993 > > > > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Tue May 15 02:25:33 2007
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