Techniques for non-deterministic operation of a stacked memory system

A method of operating a memory package having a logic die and stack of memory devices, the memory package configured to communicate with a host using multiple independent channels, the method comprising:

• receiving multiple memory access requests for a channel at the logic die;
• returning first data to the host in response to a first memory access request of the multiple memory access requests;
• returning an indication of data not ready to the host in response to a second memory access request of the multiple memory access requests for second data;
• returning a first index to the host with the indication of data not ready;
• returning an indication data is ready with third data in response to a third memory access request of the multiple memory access requests;
• returning the first index with the indication of data ready;
• and
• returning the second data to the host in response to the indication of data ready and the first index returned with the third memory access request.

A method of operating a host configured to exchange information using multiple independent channels of a memory package including a stack of memory devices, the method comprising:

• sending a plurality of memory access requests to the memory package using a single channel;
• receiving first data via the single channel in response to a first memory access request of the plurality of memory access requests;
• receiving an indication of data not ready via the single channel in response to a second memory access request of the plurality of memory access requests for second data;
• receiving a first index with the indication of data not ready;
• receiving an indication data is ready with third data via the single channel in response to a third memory access request of the plurality of memory access requests;
• receiving the first index with the indication of data ready;
• and
• receiving the second data via the single channel in response to the indication of data ready and the rust index received in response to the third memory access request.