I have a Tek TDS7404. -----Original Message----- From: Tom Dagostino [mailto:tom@xxxxxxxxxxxxx] Sent: Tuesday, July 27, 2004 11:13 PM To: Novak David Subject: RE: [SI-LIST] DDR Eye diagrams David What scope are you using? Some scopes have word triggers that will = allow you to qualify the trigger with the read or write line. Tom Dagostino Teraspeed Consulting Group LLC 503-430-1065 tom@xxxxxxxxxxxxx www.teraspeed.com -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Novak David Sent: Tuesday, July 27, 2004 8:19 PM To: si-list Subject: [SI-LIST] DDR Eye diagrams For measuring DDR eye diagrams, the best location to measure reads is at = =3D the memory controller and the best place to measure writes is at the =3D DDR. For example, measuring reads at the DDR will show more reflections = =3D than actually seen by the memory controller (I should mention that I =3D have only series termination). This sounds simple, but I cannot think of a way to make the scope =3D differentiate between reads and writes. You might suggest that I create = =3D a memory test which only does reads or only does writes. However, my =3D worst case signals are when the entire system is running. Can anyone tell me how to make the scope trigger only on reads or only = =3D on writes? Thanks, David ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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