Greetings! In measuring some DDR data traces using a 10Gs/s scope I am seeing more waveshape anomalies than with previous slower scopes. In particular, I am seeing a 77ps rise time edge inside the valid data window. This edge is embedded in a much slower (~500ps 10-90) edge - so the fast edge only exists for a short time. Previous (slower) scopes displayed nice smooth edges through this transition region - naturally. The question is : Can a short duration, small (<0.15V), fast rise time pulse cause a DDR functionality issue?? Best Regards Charles Grasso Compliance Engineer Echostar Communications Corp. Tel: 303-706-5467 Fax: 303-799-6222 Cell: 303-204-2974 Pager/Short Message: 3032042974@xxxxxxxxx <BLOCKED::mailto:3032042974@xxxxxxxxx> Email: charles.grasso@xxxxxxxxxxxx <BLOCKED::mailto:charles.grasso@xxxxxxxxxxxx> ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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