What is the result?

The readback registers for the ADAU1701 only have 24 bits, not 28 bits, so the bottom 4 bits will be truncated. You can read more about SigmaDSP number formats here:

https://ez.analog.com/message/13379#13379

Even though the readback cell is not showing the value, this circuit will still work if you connect it to the rest of your signal flow.

If you want to be able to read back the value (for debugging purposes), you could change the multiplier from 10 (28.0 format) to 10 (24.4 format), and then change the DSP Readback cell to 24.0 format. That should let you read back the value properly.

Hi BrettG,

Thanks a lot. I learned it.