Accession Number : AD0841818

Title :   AEROSPACE MEMORY SUBSYSTEM OPTIMIZATION.

Descriptive Note : Final technical rept. 8 May 67-1Aug 68,

Corporate Author : CONTROL DATA CORP MINNEAPOLIS MN MINNEAPOLIS SPACE AND DEFENSE SYSTEMS DIV

Personal Author(s) : Olson, C. D. ; Scherf, A. L. ; Meemeyer, R. W. ; Kenealey, G. W. ; Simmons, L. C.

Report Date : SEP 1968

Pagination or Media Count : 106

Abstract : This report summarizes the work performed to establish the design and show the feasibility of an extremely low cost, reliable, nonvolatile, nondestructive readout, electrically alterable computer memory for missile and aerospace applications. Features of the design include planar magnetic film storage elements in high density arrays, multiturn word lines to reduce drive currents, and gated preamplifiers which allow the sharing of sense amplifiers. The program included theoretical studies of factors affecting memory cost, the design of a 1024-word, 32-bit memory, and construction and delivery of a feasibility model. The theoretical analysis considered optimization of stack costs in large volume production by variation in complexity of the modules that comprise the memory and that represent levels of exhaustive testing and by the use of redundancy (spares) to correct random defects at the testing levels chosen. The analysis also showed how electronics costs can be minimized by variation in memory word lengths, by introducing additional levels of selection, and by low-level sense gating. The design of the memory implements these features and the model demonstrates their technical feasibility. Projection of the design to a production aerospace memory shows a need for continued investigation in the areas of sensing channel design and mass interconnection techniques for stack fabrication if the cost optimization originally envisioned is to be achieved. (Author)

Descriptors :   (*MEMORY DEVICES, FEASIBILITY STUDIES), AIRBORNE, FILMS, AIRCRAFT EQUIPMENT, SPACECRAFT COMPONENTS, OPTIMIZATION, COSTS, RELIABILITY(ELECTRONICS), LOGIC CIRCUITS.

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE