[SI-LIST] Re: negative propagation delay
- From: art_porter@xxxxxxxxxxx
- To: perry.qu@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 2 Oct 2003 14:52:06 -0600
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
Other related posts:
