first the background.
I am considering building a semi-DIY DAC based on CM6631A and, say, PCM1794.
I want to buy a ready made USB -> I2S converter board - like, for example, this one: http://www.aliexpress.com/item/CM6631A-24bit-192khz-USB-to-Coaxial-and-Optical-fiber-SPDIF-and-I2S-by-LJM-New-version/2030271910.html and build the DAC proper and analog output part myself.
So my questions are related to CM6631A as USB -> I2S converter and are the following:
1) is USB asynchronous mode (i.e. CM6631A board XTALs are used as clock generators, and computer is a slave, i.e. audio transfer rate is determined by the XTALs) ?
2) MCLK of I2S can be various multiples of sample rate - is this supported ? According to what I found on the web Windows driver supports this feature;
3) CM6631A has embedded 8051 controller, so can new CM6631A firmware be loaded into the board memory under Linux ? CMedia provides such a utility for Windows.
Can anybody provide output of
amixer scontrols
for a CM6631A based card ?
Thanks,
Sergei.
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