Why does ram read back as all zeros after writing to it?

I am finding that I can only read back zeros from the ADAU1442 rams after writing any data into them.

I can read back registers in the E000 address space just fine but not the contents of the data, program or parameter ram.

I am using the I2C control port.

Any idea what is going on with this?

Are these rams write only?

Audio Signal Processors

adau1442

SigmaDSP Audio Processors