Robust and secure memory subsystem

A system for managing a memory address space, comprising:

• a memory controller operative to generate and communicate a memory request for data in the memory space to a first memory device;
• a first memory device comprised of:
• a memory for storing data in a first level of the memory space;
• a memory map cache within the first memory device configured to map the location of data in the OS visible memory space, wherein the data may be physically stored on the first or second memory devices;
• and
• a second memory device comprised of memory for storing data in a second level of the memory space.

A method implemented in a memory device having a map cache configured to manage a memory space, the method comprising:

• receiving a memory access request from a memory controller;
• attempting to access the requested data from a first level of memory maintained on the memory device that contains the map cache;
• performing a lookup in the map cache to determine whether the requested address is resident in the first level of memory;
• if the requested data is not resident in the first level of memory, causing a re-map address to be calculated that identifies a location of the requested data in a lower level of memory;
• and
• if the requested data is resident in the first level of memory, providing the memory controller with access to the requested data.