From what I can read, you need to send a command to read/write whatever it is you want to do. Also, what is confusing is the data for the D36561 - what chip are you using? The datasheet talks about C1,2,3, etc commands - I dare say these are command classes. You write it a command, it responds with ack and you read the status. Depending on the command is what follows.

This device is a DSP running software - not a magic ASIC that gives you a memory mapped memory bus interface.

The sequence would be something like:

<command> something like read memory??
ack -read status
<optional data> like a memory address or whatever
ack - read status
<read the data you requested>

Is this clearer?