Combined on-package and off-package memory system

A base layer enclosed within a package, the base layer comprising:

• a first interface for coupling a processor to the base layer;
• memory management logic that offloads memory interface steering tasks from the processor and is coupled between the first interface and a memory system for processing memory access requests received at the first interface using interface mapping information stored in the memory management logic to map addresses received from the processor to interface specific addresses for the first interface and a second interface;
• a memory device controller that is enclosed within the package and coupled between the second interface and the memory management logic, wherein the memory device controller stores second translation information for mapping the interface specific addresses to locations in at least one memory device;
• and
• at least one memory stack that is enclosed within the package and is directly coupled to the memory management logic through a first controller within the base layer, wherein the first controller stores first translation information for mapping the interface specific addresses to locations in the at least one memory stack.

A method, comprising:

• receiving memory access requests from a processor that is coupled to a base layer;
• and
• processing the memory access requests by memory management logic fabricated within the base layer and coupled between the processor and a memory system by:
• using interface mapping information stored in the memory management logic to map addresses received from the processor to interface specific addresses;
• transmitting a first portion of the memory access requests to at least one memory stack that is enclosed within a package that encloses the base layer and is directly coupled to the memory management logic through a first controller within the base layer, wherein the first controller stores first translation information for mapping the interface specific addresses to locations in the at least one memory stack;
• and
• transmitting a second portion of the memory access requests to at least one memory device that is external to the package and coupled to the memory management logic through a memory device controller within the package, wherein the memory device controller stores second translation information for mapping the interface specific addresses to locations in the at least one memory device.