I just realized that I miss-stated my original message. The test we are running is a loopback test. That is 5 inches to the connector and 5 inches back. Thus, the actual data path length is 10 inches. My apologies for my error on this point. Regards Rudy Sterner ----- Original Message ----- From: "DAmbrosia, John F" <john.dambrosia@xxxxxxxxxxxxxxxxxxx> To: <rsterner@xxxxxxxx> Sent: Monday, June 10, 2002 8:22 AM Subject: RE: [SI-LIST] Trace Width @ 3Gb/s > Rudy, > Trace width will make some difference in performance, but I can't believe at > 5 inches you will be shut down. You do not comment on how thick the > backplane this trace is running on is... that could actually be more of the > killer... a top layer connection on a 0.300" backplane... could be a major > problem... > > If you have any further questions please feel free to contact me... > > John > > -----Original Message----- > From: Rudy Sterner [mailto:rsterner@xxxxxxxx] > Sent: Monday, June 10, 2002 11:14 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Trace Width @ 3Gb/s > > > Hello, > > We have some issues with a SerDes which we think > may be related to the trace width on the serial line. The > serial port is a differential pair passing data at 3 Gb/s. > The trace width is 4 mils. Length is approximately 5 inches. > The differential impedance is 100 Ohms. Other information > which may be of use is the board material is FR-4 with an > Er of 3.9. It is specified at this data rate. > > My question is: Are the traces too narrow? Should I > expect better performance with 8-mil traces? > > Thank You > > Rudy Sterner > LSI Logic > > > -- Binary/unsupported file stripped by Ecartis -- > -- Type: text/x-vcard > -- File: Rudy Sterner.vcf > > > ------------------------------------------------------------------ > 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 > > ------------------------------------------------------------------ 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