topic Re: How to setting S/PDIF on DSP5672x?? in Other NXP Products

How to setting S/PDIF on DSP5672x??

AlexTsai — Fri, 06 Feb 2009 10:09:19 GMT

I test to output S/PDIF on DSP5672x
configure as follows...
SCR = $000414
STC = $000405
SIE = $000002
HCKT3 = 16.9344MHz

Every (1/44.1K) occur interrupts one time, and put one sample L/R audio data to STL&STR.
The SPDIFOUT1 have to transmit signal, BUT my D/A converter can't output audio.
I don't konw where makes a mistake
Who can help me...

Message Edited by AlexTsai on 2009-02-05 06:12 PM

Re: How to setting S/PDIF on DSP5672x??

jbrandonnelson — Sun, 01 Mar 2009 13:32:01 GMT

I'm not sure if you are having the same issue that I was having, but I'll offer what helped me to get the S/PDIF transmitter working. In my situation, the S/PDIF bitstream being transmitted by the DSP looked valid and the receiving devices receive clock would lock with it, but I could not hear any audio output. I set SCR = $000434 which changes the validity control bit. After setting this bit, the S/PDIF output can be heard through the receiving device. I hope this helps.

Re: How to setting S/PDIF on DSP5672x??

AlexTsai — Tue, 03 Mar 2009 14:23:14 GMT

YES!! I can hear audio output after set SCR=$060434.

Thank very much!!

Re: How to setting S/PDIF on DSP5672x??

jbrandonnelson — Mon, 09 Mar 2009 23:12:39 GMT

I'm glad that it works for you! I had to read through that part of the documentation carefully to figure it out. I was clearing ValCtrl thinking that it would clear the validity bit (per the S/PDIF specification), but after careful reading found that you clear ValCtrl to set the validity bit and set ValCtrl to clear the validity bit which was a little confusing.