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TLV320AIC3254: Power saving function

Part Number: TLV320AIC3254
Other Parts Discussed in Thread: DIR9001,

Dear Support,

The customer wants to add power saving function on their product.
Detect digital or analog and SPDIF input and report to other chip.
Do you have any advice?
How to do?
They use DIR9001+TLV320AIC3254.
Which data address should be read on Aic3254 to monitor the input level on the digital input.