Hi, There won't be problems if you use either. I always prefer TH connectors when possible. Terminations a normally placed at the end of the line. Normally you have a component there either on top or on bottom side.
Mira --- Anand Kulkarni <[EMAIL PROTECTED]> wrote: > Hi all, > > my question is not protel specific but it still has > to do with pcb > so i'll go ahead and ask it here.I hope it is > alright . > > my problem is as follows : > > I have to choose between using > > 1) 68 pin SCSI surface mount female connector > OR > 2) 68 pin SCSI thru hole female connector. > > > This connector ((( actually there are 16 of the same > connector repeated > on the board ))) has traces going from its pins ((( > pads for surface > mount if I choose that ))) to the I/O pins of a > ball-grid-array FPGA part. > > These traces would be routed on various signal > layers . > > Now if I choose the thru-hole connector then the > traces can directly > attach to the connector pins in whichever layer it > is routed ((( > since the connector pins will go thru all possible > layers ))) ; > on the other hand if I choose the surface mount > connector I will > need every trace to be brought up to the top signal > layer so that > they may attach to the surface mount connector pad. > > Am I right ? > > Further in case I choose the thru-hole connector and > I need to use > a terminating resistor , what do I have to do ? > Since the trace going from the connector to the FPGA > is entirely > contained in one of the internal signal layers ((( > and the terminating > resistor must be placed somewhere in between the > FPGA I/O pin and > the connector pin ))) , where can I put the > terminating resistor ? > > What is generally done in such a situation ? > > please do reply with your suggestions, > > thanks very much > > Anand Kulkarni > > > > * * * * * * * * * * * * * * * * * * * * * * * * * * > * * * * > * To post a message: > mailto:proteledaforum@;techservinc.com > * > * To leave this list visit: > * http://www.techservinc.com/protelusers/leave.html > * > * Contact the list manager: > * mailto:ForumAdministrator@;TechServInc.com > * > * Forum Guidelines Rules: > * > http://www.techservinc.com/protelusers/forumrules.html > * > * Browse or Search previous postings: > * > http://www.mail-archive.com/proteledaforum@;techservinc.com > * * * * * * * * * * * * * * * * * * * * * * * * * * > * * * * __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:proteledaforum@;techservinc.com * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:ForumAdministrator@;TechServInc.com * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@;techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
