Kathir, As long as your processor swings around VCCIO/2 you can make your signaling levels. W/ series resistors in the middle only and traces that aren't too long you can probably make 320Mbps timing. Resistors at both ends for DQ will buy a little more margin than resistors in the middle only. But if you are going to do that it begs the question of why you don't generate VTT and do it per spec. I would still terminate the DQS lines. Thevenin w/ short stubs s/b good enough. Steve. Kathiresan K wrote: > Hi, > I need to have a single chip DDR1 (160 MHz, 16-Bit) memory for a processor. > I don't want to provide VTT terminations. I'll keep the trace length as > minimum as possible. I may provide series termination but I haven't done > pre-layout simulation yet. > Can somebody please clarify whether it can be designed without VTT > termination? If yes, what can be the maximum trace length I go for? If I'm > providing series termination, should I provide at both the ends for > bi-directional signals? > > Regards, > Kathir > > > ------------------------------------------------------------------ > 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 > > > > -- Steve Weir Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 California office (408) 884-3985 Business (707) 780-1951 Fax Main office (401) 284-1827 Business (401) 284-1840 Fax Oregon office (503) 430-1065 Business (503) 430-1285 Fax http://www.teraspeed.com This e-mail contains proprietary and confidential intellectual property of Teraspeed Consulting Group LLC ------------------------------------------------------------------------------------------------------ Teraspeed(R) is the registered service mark of Teraspeed Consulting Group LLC ------------------------------------------------------------------ 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