Unified Memory Architecture

Computer memory systems are currently based on a hierarchical architecture, driven by the mismatch between the speed of the very fast processor and the orders-of-magnitude slower disk storage. The proposer (IMEC) is developing a new magnetic, solid-state memory based on giant magnetoresistance (GMR) that combines the permanence and radiation hardness of magnetic storage with the random access, small size, light weight, ruggedness and speed of semiconductor memory. Its unique combination of characteristics enable IMEC's memory to replace all types of computer memories, from registers in a CPU to magnetic disks, with a single technology. The proposed Phase I effort will design a unified memory architecture using IMEC's GMR technology for all memory/storage requirements of a computer. Tradeoffs among speed, power, storage capacity, size, reliability, cost and other factors will be considered. A best set of design characteristics will be chosen to meet the optimum effectiveness for each of the computer's memory subsystems. The main characteristics of an operating system for such a unified architecture will be identified, compared to those of a disk operating system, and outlined for design. The result will be to simplify the present hierarchical structure while simultaneously enhancing system characteristics. Systems with IMEC's unified memory architecture will find application in multiple military, industrial and commercial sectors, including computers, modems, faxes, telephones, games, cameras, pagers, key-tag IDs, set-top boxes, digital switching, mobile data communicators, satellite receivers, industrial controls, diagnostic and maintenance equipment, postage meters, medical imaging systems, graphics and automotive applications.