the voltage on the c6711-dx-pin was approx. 3,3v, changes to zero and then starts the data-transfer. but now on the c6713-dsk, it`s always zero, but the DR-pin of the c6713-dsk`s is always 3,3v like the c6711, so when i connect these pins, the voltage is approx. 1,7v with no changing during the data-transfer. does anybody know how i can change the dr- or dx-pin-voltage ? can`t find any settings, "actice high/low" is only for the framing... sincerely, olaf |
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invert the DX-pin on McBSP ?
Started by ●September 9, 2003
Reply by ●September 10, 20032003-09-10
Olaf,
Something is wrong! Do not leave those pins connected like that. Your
symptoms imply that one pin is "driving low" and the other pin is "driving high"
- creating a voltage divider effect. Double check your pins and
config.
Which specific pins are you connected to??\
mikedunn
olaf636 <c...@t-online.de> wrote: the voltage on the c6711-dx-pin was approx. 3,3v, changes to zero and |
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Reply by ●September 10, 20032003-09-10
> Something is wrong! Do not leave those pins connected like that. Your symptoms imply that one pin is "driving low" and the other pin is "driving high" - creating a voltage divider effect. Double check your pins and config. > > Which specific pins are you connected to??\ > > mikedunn dear mike, i have connected the DX0-pin from one dsk to the DR-pin from another dsk. on the master-dsp is the DX-pin on 300mV and the DR-pin on 3,1V like the slave-DR-pin. but i believe that the McBSPs are not initialised correctly, so perhabs they are still "connected" to the onboard AIC23-codec, because when i write the code for the McBSP1 on the master-dsp i see nothing on the scope....no clock, no frame, no data and DX/DR-pins are low...no 300mV, just 0V...... |