Hello, generating a single official eye-mask for a DDR2 source Sync interface is difficult (impossible ?!?). There are many parameters that are need to fulfilled on a cycle by cycle basis and with different timing references. I tried to explain this a bit in the DDR3 Setup_Hold tutorial (valid for DDR2 as well): http://www.eyeknowhow.de/index.php/downloads/5-movies.html I usually measure the open data window (ODW) from last AC crossing to first DC crossing and compare this to the required setup/hold times (so i do not draw the required eye Mask, but i measure what my system provides). Just one example why it is difficult to work with a simple eye mask: If you draw the "mask" according to setup and hold times then you get a mask that is smaller than the allowed tDIPW (data input pulse width). If you have a simulator it most likely provides a method to do the check on a cycle by cycle basis (what would be the correct way to do). For ADS this check is available too, but as mentioned above I do use this ODW measurement based on own Code. Hermann EKH - EyeKnowHow Hermann Ruckerbauer www.EyeKnowHow.de Hermann.Ruckerbauer@xxxxxxxxxxxxx Itzlinger Strasse 21a 94469 Deggendorf Tel.: +49 (0)991 / 29 69 29 05 Mobile: +49 (0)176 / 787 787 77 Fax: +49 (0)3212 / 121 9008 schrieb Balamanikandan K: > Hi > I would like to know whether any standard eye mask available for DDR2 > -address/command signals or not. Please clarify me. > > ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu