Steve, transmission line continuity is the most important issue, particularly on the timing strobe(s). It is not how far you go, but how much you disrupt the continuity relative to the bandwidth you enclose with both the signal rate and rise/fall times. Steve. At 11:13 AM 6/16/2006, Steve Lin wrote: >Dear friends, > > >I have a simple design and see if you guys can give me some advices. > > > >I am planning to run a parallel bus (8 data bit, few address lines, /CS, >/OE, /WE, etc) on the back plane. The bus will go thru 6 loads in a daisy >chain fashion (6 back plane connectors), and is asynchronous that can have >read/write access time of few hundreds nano-seconds (access timing is >programmable and can be quite relaxed). The total length of the bus would >approximately be around 50" (including the traces on daughter cards). > > > >The driving buffer I am using is SN74ALVTH16244 which is a 32mA driver. > > > >Do I need some sort of termination on the bus to avoid ringing? > >What are the most important things that I should keep an eye on? > > > >Thanks > > > >Steve > > > > > > > >------------------------------------------------------------------ >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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > >List technical documents are available at: > http://www.si-list.org > >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 > ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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