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Sparse distributed memory: Principles and operationSparse distributed memory is a generalized random access memory (RAM) for long (1000 bit) binary words. Such words can be written into and read from the memory, and they can also be used to address the memory. The main attribute of the memory is sensitivity to similarity, meaning that a word can be read back not only by giving the original write address but also by giving one close to it as measured by the Hamming distance between addresses. Large memories of this kind are expected to have wide use in speech recognition and scene analysis, in signal detection and verification, and in adaptive control of automated equipment, in general, in dealing with real world information in real time. The memory can be realized as a simple, massively parallel computer. Digital technology has reached a point where building large memories is becoming practical. Major design issues were resolved which were faced in building the memories. The design is described of a prototype memory with 256 bit addresses and from 8 to 128 K locations for 256 bit words. A key aspect of the design is extensive use of dynamic RAM and other standard components.
Document ID
19920001076
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Flynn, M. J.
(Research Inst. for Advanced Computer Science Moffett Field, CA, United States)
Kanerva, P.
(Research Inst. for Advanced Computer Science Moffett Field, CA, United States)
Bhadkamkar, N.
(Research Inst. for Advanced Computer Science Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1989
Subject Category
Computer Operations And Hardware
Report/Patent Number
RIACS-TR-89-53
NAS 1.26:188901
CSL-TR-89-400
NASA-CR-188901
Report Number: RIACS-TR-89-53
Report Number: NAS 1.26:188901
Report Number: CSL-TR-89-400
Report Number: NASA-CR-188901
Accession Number
92N10294
Funding Number(s)
CONTRACT_GRANT: NCC2-387
CONTRACT_GRANT: NAGW-419
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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