The receiver IO model i selected is Without ODT. I will try with single Pulse..... On Wed, Oct 22, 2014 at 5:39 PM, preetesh rathod <preeteshrathod@xxxxxxxxxxx > wrote: > Hello > You haven't mentioned anything about end termination (ODT) if > you using it. In your case it seems impedance mismatch at both ends. So > your single pulse reflections may not die out in single cycle which can > create such type of results at different trace lengths. I suggest you to > simulate with single edge which will help you to understand what is going > on in more detail in terms of reflections. > > Regards > Preetesh Rathod > > > On Tuesday, 21 October 2014 7:30 AM, Bert Simonovich < > bertsimonovich@xxxxxxxxxx> wrote: > > > This looks like a case of driver impedance mismatch to the transmission > line. The driver likely has a lower impedance than the transmission line. > Try increasing the 0 ohm resistor to a value equal t-line impedance minus > the driver impedance. Eg. if the driver impedance is 15 ohms, and the > t-line is 50 ohms, then the resistor should be 35 ohms. > > Sent from my iPad > > > On Oct 20, 2014, at 8:41 PM, Mallikarjun K <malli.1729@xxxxxxxxx> wrote: > > > > Hi, > > I am trying to simulate a topology. > > it consists of driver --> 0 ohm resistor --> MS line (length varied from > > 1000 mils to 10000 mils) ---> DDR2 dq 533 io(receiver). > > > > I am just simulating to findout how much can be the maximum length, > before > > signal degrades badly. > > > > As i am increasing the length, i am seeing more degradation at the Driver > > than at the receiver. there is degradation at the receiver , but it is > OK. > > > > I have uploaded 3 files 1000mils,4800mils and 10000mils > > @ 10000mils there is delay between input and output but still output > > quality and input quality are good compared to 4800 mils case. > > > > why is this? 10000mils case should have more degradation > > > > http://s3.postimg.org/q6wi1e283/ddr2_io_0000_dq_533_MS3_1000.png > > > > http://s2.postimg.org/4qw22kazt/ddr2_io_0000_dq_533_MS3_4800.png > > > > http://s27.postimg.org/o988g61zn/ddr2_io_0000_dq_533_MS3_10000.png > > > > > > ------------------------------------------------------------------ > > 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 > > > > > ------------------------------------------------------------------ > 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 > > > > > ------------------------------------------------------------------ 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