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人家datasheet里写了:
When the AK4497 is in pin control mode, PCM mode is only available. External digital filter I/F can be selected by setting DP bit = “0” and EXDF bit = “1”. When using an external digital filter (EXDF I/F mode), data is input to each MCLK, BCK, WCK, DINL and DINR pin. EXDF bit controls the modes. When switching internal and external digital filters by EXDF bit, the AK4497 must be reset by RSTN bit. A Digital filter switching takes 2~3k/fs. The AK4497 is in DSD mode when DP bit = “1” and EXDF bit “1”.
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