Drop me an email if you need some of these, they are going hot but I can get you a discount, and everyone on the SI list. :) art_porter@xxxxxxxxxxx wrote: > Hey, if you can build enough of those negative delay buffers in series, we > can watch next week's football game and bet on the winners. > > -----Original Message----- > From: Perry Qu [mailto:perry.qu@xxxxxxxxxxx] > Sent: Thursday, October 02, 2003 1:03 PM > To: si-list > Subject: [SI-LIST] negative propagation delay > > Hi, > > I'm using ICX for SI/timing analysis. One thing I noticed, if a driver > IBIS specified a large reference load (e.g., 50pF for uP), I will always > end up with a negative propagation delay since my actual loading is much > smaller compared with reference load. > > Would like to understand how I should correct the number to reflect my > actual loading for timing analysis. I would think we can get the > internal logic delay of driver through: (Tco - time_to_Vmeas@reference > load); But then, how shall I add buffer delay for a real load and > propagation delay for a real load--taking into account all the > reflection effect (e.g., a daisy-chained bi-directional data bus). > > Thanks > > Perry > > -- > Perry Qu > > Design & Qualification | 600 March Road > Alcatel Canada | Ottawa, ON K2K 2E6, Canada > > DID: (613) 7846720 | FAX: (613) 5993642 > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > -- Perry Qu Design & Qualification | 600 March Road Alcatel Canada | Ottawa, ON K2K 2E6, Canada DID: (613) 7846720 | FAX: (613) 5993642 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu