Hi SI gurus, The series resister mentioned in the SSTL-2 spec is meant to isolate the long stubs (viz stubs on the DDR modules) off the main bus. I am not able to figure out how this is acheived with the series resister. I understand that the series resister damps the reflections. Can somebody out there help me understand how this works. Also i notice that the guidelines mentioned by the chipset manufacturer for DDR signals, tellls us to place the series resister closer to the first DIMM rather than near the controller. By placing the series resister closer to the chipset, wont we acheive the same results? Thanks in advance. Regards, Anand. ------------------------------------------------------------------ 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