ADAU1452 TDM8 input, 20kHz signal play, there is pop noise on speaker and periodly.

The sigma studio version is V4.5

Fish,

I believe the issue is that you are seeing the Fs mismatch between the local clock and the A2B bus clock. If the DSP is slave to A2B, then all of the peripherals must be slave to the A2B clock, as well, or come in through ASRCs. The DSP cannot be a clock master to peripherals if the core is a clock slave. If this is your own board, the hardware rework likely would be difficult to fix. I would suggest that you keep the I2S input as a clock master, but pass it through an ASRC to bring it to the core rate. Also, you should select the START_PULSE, which is the effective frame sync for the core, to be the serial port rate of the A2B input. This is controlled on the CORE_CONTROL tab in the upper left.

Ken

Thanks Ken,

I'll try START PULSE.

Fish.

Hello Ken, 

I have tried START Pulse, set to Serial port 0, the pop noise also exist.

If I make all clock slave from A2B,  I doubt the driver for A2B bit clock and lrclock.

If I make system clock like below, do you think it ok or not.

Thanks.

Fish.