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DSD interface for audio

Question asked by Børge Strand-Bergesen on Mar 22, 2019
Latest reply on Apr 11, 2019 by Yuri Muhin

Hi guys


I'm wondering if the RT1015 or similar can be used to implement a DSD audio format and similar. In short, these series formats are similar to I2S but there are two data bits, one for L and one for R. 


Can this be done with one series interface, or with two which are synchronized? The interfaces would typically be synchronized by the same external clock signal(s) and fed from one or two internal DMAs. 


Both DSD and DAC interfaces named "no oversampling" or "direct" use two channels of data where I2S uses one. In DSD the word clock is disregarded since the word depth is 1 bit. In "direct" mode a shared word clock is used. 


In both cases, data arrives in packetized form over USB and is sent out to the DAC with the L and R bits in perfect sync. 





P.S. I asked a similar question yesterday but I can't find that post now, and that account won't let me log in, even though I accept cookies and agreements and what not.