We have a system with a backplane with five slots for ADSP-21065L
DSP's based custom cards. Each DSP card has SPORT 0 DR0A and DT0A tied together. TCLK0, RFS0, and the common DT signals are then each run through a 33ohm series to the backplane bus. The problem is that we are having significant noise problems. One slot in our back plane seems to have problems on the TCLK line as the audio crackles until we connect a scope probe to the TCLK line. We have tried various resistor and capacitor combinations which only seem to make the problem worse. We have noted item 21 in the Anomaly list but are not sure how to proceed to fix the problem. Has anyone out there dealt with sport signal termination on the 065L successfully? If so, what was your solution, if you wouldn't mind sharing it. Thanks for your help. Steve Holle Link Communications, Inc. 1035 Cerise Rd. Billings, MT 59101 |
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21065L SPORT Signal Termination
Started by ●July 1, 2004
Reply by ●July 2, 20042004-07-02
Steve Holle wrote: ... > Has anyone out there dealt with sport signal termination on the > 065L successfully? Steve, have you looked at ADI's EE 74 which deals with the conditioning of SPORT signals? Regards, Andor |
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Reply by ●July 2, 20042004-07-02
At 11:37 PM 7/1/2004, andor_bariska wrote: >Steve Holle wrote: >... > > Has anyone out there dealt with sport signal termination on the > > 065L successfully? > >Steve, > >have you looked at ADI's EE 74 which deals with the conditioning of >SPORT signals? We have looked at this ap note and although it was helpful, what eventually did the trick was putting an 74xxx08 buffer on the TCLK0 and RFS0 lines from the card driving those signals. The data sheet is pretty vague about drive capability and what kind of buffers to use. The data lines cannot be buffered, of course, since we have the DR and DT lines tied together. We are a little worried about margins on the data lines since we can't buffer them. >Regards, >Andor > >_____________________________________ >Note: If you do a simple "reply" with your email client, only the author >of this message will receive your answer. You need to do a "reply all" if >you want your answer to be distributed to the entire group. > >_____________________________________ >About this discussion group: > >To Join: Send an email to > >To Post: Send an email to > >To Leave: Send an email to > >Archives: http://groups.yahoo.com/group/adsp > >Other Groups: http://www.dsprelated.com/groups.php3 > >Yahoo! Groups Links > > Steve Holle Link Communications, Inc. 1035 Cerise Rd. Billings, MT 59101 |