I think you should draw the circuit: The way that it is, and other configurations that you might try. See what happens to the DC bias voltage and current for each combination for both a high and a low state. That will answer both your questions. Steve. On 4/28/2012 5:07 AM, Hithesh wrote: > Some questions about DDR2 termination - > Let's say it's a Read operation from Memory to FPGA > > DDR2 ---> series termination res--->50 ohm PCB Tx line -->50 ohm > termination resistor at FPGA to Vtt. > > Why should the 50 ohm resistor be terminated to Vtt, why not ground (like > RF amplifiers)? > > Is the DDR2 output voltage 1.8v? If yes, then the max voltage at FPGA will > be 0.9v. > > Thanks, > -Hithesh > > > ------------------------------------------------------------------ > 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 > > > -- Steve Weir IPBLOX, LLC 150 N. Center St. #211 Reno, NV 89501 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax All contents Copyright (c)2012 IPBLOX, LLC. All Rights Reserved. This e-mail may contain confidential material. If you are not the intended recipient, please destroy all records and notify the sender. ------------------------------------------------------------------ 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