Hi all i want to know practially how to do a timing analysis in the board i have these questions 1.wht flight time values we have to take for setup and hold time marigns calculatons i.e can we take flight time for the rising edge for both setup and hold calculations?if we get a negitive values of flight times,can we take these -ve flight times into calculations. 2.Is it correct: *hold margin= data valid window- setup margin-setup time- hold time.* ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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