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PCM6260-Q1: 6-ch Audio data's distortion are not good

Part Number: PCM6260-Q1

I transmit 6-ch analog audio with PCM6260, the output data format is TDM4 in slave mode.

And the FS is 96kHz, BCLK is 128*FS from the master DSP, so the ASI word is 32bit.

Because I use TDM4 mode, so i need use 2 output data port for 6-ch output. Pin29 output channel1~channel4, and Pin28 output channel5~channel6 without MCLK input.

But the output's distortion is not normal, if i change 6-ch to 4-ch input, it will be OK.

As I know, the different between 6-ch ann 4-ch is channel5 and channel6's configuration.

So if there is something else in register Maps i don't know.