hai i am very intersted to know about the 20-H rule in board design and Cross talk.how the cross talk is occur on the board.could you explain that. Thanks&Regards Gopalakrishnan.S -----Original Message----- From: Ched-Chang Chai [mailto:ched_chang@xxxxxxxxxxx] Sent: Monday, December 02, 2002 9:35 AM To: Gopalakrishnan Sethuraj; si-list@xxxxxxxxxxxxx Subject: Re: [SI-LIST] terminator resistor Hi Gopalakrishnan, If you are using source termination, the resistor value should be the difference between the trace characteristic impedance (Zo) and the driver output impedance (Zout): Termination resistor = Zo - Zout. Theoretically, the signals will be fully absorbed at the driver after one round trip time. Anyway, I found that the output impedance is not a constant value. From my experience, termination resistor with 22-47ohm will absorb most of the ringing. -- Regards, Chai >From: "Gopalakrishnan Sethuraj" <gopalakrishnan.sethuraj@xxxxxxxxx> >Reply-To: gopalakrishnan.sethuraj@xxxxxxxxx >To: <weirsp@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx> >Subject: [SI-LIST] terminator resistor >Date: Mon, 2 Dec 2002 09:03:49 +0530 > >hai > >how to find out the terminator resistor value when the ringing is occur in >high speed signal transmission line.could you let me know.is there any >specfic formula to find the terminator value? > >Thanks&Regards >Gopalakrishnan.S _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 -- Attached file included as plaintext by Ecartis -- -- File: Wipro_Disclaimer.txt **************************Disclaimer************************************ Information contained in this E-MAIL being proprietary to Wipro Limited is 'privileged' and 'confidential' and intended for use only by the individual or entity to which it is addressed. You are notified that any use, copying or dissemination of the information contained in the E-MAIL in any manner whatsoever is strictly prohibited. *************************************************************************** ------------------------------------------------------------------ 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