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TLV320AIC3204: How to modify biquad filter coefficient values once AIC3204 chip is configured?

Part Number: TLV320AIC3204


I want to read/write ADC coefficient values when AIC3204 chip is already configured. I have observed that there is a register 81 in page 0, should be modify to give read/write access to ADC coefficient registers.

For example, Consider that ADC right channel is powered on in the initial process. I am using page 9 registers (ADC right channel) for read/write ADC coefficient values.  So when I read/write the ADC coefficient values I just power down the ADC right channel but it is not happening. After power down operation I am not able to read back the page 9 registers. I am able to read those registers when I power down the ADC channel from the initial process. So is it like once ADC channel is powered on, We can not power down the ADC channel? 

Thank you,