FYI, a tweaker I know (in France) has developped a word clock input for the SB.
He has a working prototype and told me that he will soon be able to start a
small serie production. I hope to get one soon.
I suppose this is possible if you can configure the MAS3539 to be a slave for the i2s clocks, but I never tried it so I can't say how well it would work. You'd need to also supply master clock and bit clock though, and I don't know if this is possible except in PCM mode.
BTW the 74AC125 is used to reverse the direction of the of the bit clock between the ip2k and the DSP. When playing mp3, the ip2k is the master and the interface is simply 2-wire SPI (no word clock). When playing PCM, the DSP is the clock master and the format is i2s.
I'd be happy to take a (quick) look at his schematic if it's of any help.
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