CDM4 in the CD624
Reading all this about updating CD-players, I have very good results with the old and cheap CD624! The CDM4 is very good, reads all there is. The main board is well designed and the connections for the I2S behind the SAA 7310 are concentrated on a (not mounted) plug. The I2S has the Philips standard: 'justified left with one bit delay'.
The most nice thing is: it has a compete large separate section to build in the new back end and its power supply!
Reading all this about updating CD-players, I have very good results with the old and cheap CD624! The CDM4 is very good, reads all there is. The main board is well designed and the connections for the I2S behind the SAA 7310 are concentrated on a (not mounted) plug. The I2S has the Philips standard: 'justified left with one bit delay'.
The most nice thing is: it has a compete large separate section to build in the new back end and its power supply!
I2S and the digi-filter SM5847AF
The SAA7310 in my CD624 offers I2S with 'left justified with one bit delay' as I stated before.
For the back end I try to use a part of Guido Tent cs. tube DAC. This DAC is equiped with the SM5847AF digital filter which only accepts I2S 'justified right'.
I moved the data 15 bits to the right with a shift register, but is does not work! It could be that the clock from the SAA7310 should be inverted before clocking the shift register.
I think the DACs are missing the sigh-bit, so....
Any suggestions?
The SAA7310 in my CD624 offers I2S with 'left justified with one bit delay' as I stated before.
For the back end I try to use a part of Guido Tent cs. tube DAC. This DAC is equiped with the SM5847AF digital filter which only accepts I2S 'justified right'.
I moved the data 15 bits to the right with a shift register, but is does not work! It could be that the clock from the SAA7310 should be inverted before clocking the shift register.
I think the DACs are missing the sigh-bit, so....
Any suggestions?
Hi,
The circuit posted in the first post of this thread...
http://www.diyaudio.com/forums/showthread.php?s=&threadid=104133&highlight=sm5840
...shows how the saa7310 is interfaced to the sm5840 in a CD930, using shift registers for format conversion. Not sure if it helps.
The circuit posted in the first post of this thread...
http://www.diyaudio.com/forums/showthread.php?s=&threadid=104133&highlight=sm5840
...shows how the saa7310 is interfaced to the sm5840 in a CD930, using shift registers for format conversion. Not sure if it helps.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=104133&highlight=
Sorry, not sure what happened there.
edit.. tried the old one and that worked for me as well. You are just clicking on the link aren't you?
If you're still stuck, search for sm5840, and click on the thread 'confusion over I2S buffering'.
Sorry, not sure what happened there.
edit.. tried the old one and that worked for me as well. You are just clicking on the link aren't you?
If you're still stuck, search for sm5840, and click on the thread 'confusion over I2S buffering'.
Where can I find the schema/service doc of the CD930?
ESL + MFB = the best of 2 worlds ==> www.by-rutgers.nl
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