Hello Han, Both Eric Bogatin www.bethesignal.com and Howard Johnson=20 www.sigcon.com have excellent books that cover this subject as well as = their workshops. Chapter 8 "Transmission Lines and Reflections" in Eric's book Signal = Integrity Simplified and Chapter 6 "Terminations" in Howard's book = High-Speed Digital Design should be very helpful for you. As Terry Fox mentioned, this type of problem benefits greatly from = running the simulations to see what works best for your specific = application and board routing topology. Good Luck, Heidi Barnes Americas Application Development Center Semiconductor Test Solutions Verigy -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of Han Li Sent: Monday, July 02, 2007 11:26 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] source-termination and daisy chain question Hi everyone, It seems a simple question,But I still have something i cannot completly understand. A daisy chain is often used in multidrop topology, which need an end-termination. And, source-termination doesnot work properly in daisy chain,because the device in the middle of the chain would get a plateau;using source-termination, all load should be at the end of the line. So, in a design , i should figure out minimul distance between, say two receivers. In other words, I should decide beyond what distance between two receivers , source-termination should not be used, and this topology can be named a daisy chain? Could anyone provide a deeper explanation? Thanks a lot! ---- ------ ------- Driver---------revceiver_1-----------------------receiver_2 ---- ------- -------- |-------------distance---------| ------------------------------------------------------------------ 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: =20 //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 =20 ------------------------------------------------------------------ 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