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关于I2S 主从设置问题

Other Parts Discussed in Thread: PCM1808

如上图所示,有两组I2S 信号(CS8416与PCM1808)送入到CS48540(DSP)中处理,在这四个IC中是依据什么来设置主从关系的呢?谢谢!

是依据I2S信号流向从左到右,或者是按主时钟(MCLK)分配来设置的呢?