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1. (WO1991007756) METHOD OF REFRESHING MEMORY DEVICES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007756 International Application No.: PCT/GB1990/001757
Publication Date: 30.05.1991 International Filing Date: 14.11.1990
Chapter 2 Demand Filed: 25.04.1991
IPC:
G11C 11/406 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
11
Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
21
using electric elements
34
using semiconductor devices
40
using transistors
401
forming cells needing refreshing or charge regeneration, i.e. dynamic cells
406
Management or control of the refreshing or charge-regeneration cycles
Applicants:
ACTIVE BOOK COMPANY LIMITED [GB/GB]; Abberley House Granhams Road Great Shelford Cambridge CB2 5LQ, GB (AllExceptUS)
WHEELER, David [GB/GB]; GB (UsOnly)
JACKSON, Martin [GB/GB]; GB (UsOnly)
Inventors:
WHEELER, David; GB
JACKSON, Martin; GB
Agent:
NASH, Keith, Wilfrid ; Keith W. Nash & Co. Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP, GB
Priority Data:
8926119.218.11.1989GB
Title (EN) METHOD OF REFRESHING MEMORY DEVICES
(FR) PROCEDE DE RAFRAICHISSEMENT DES DISPOSITIFS DE MEMOIRE
Abstract:
(EN) A method of refreshing DRAMs in which a small section S of the chip is refreshed at a lower rate than the major section M, data errors arising in section S are sensed, and the refresh rates of the two sections are then adjusted, maintaining the section M refresh rate higher than that of section S by a safety factor, until data errors in section S are just not significant.
(FR) Procédé de rafraîchissement des RAM dynamiques selon lequel une petite section S de la puce est rafraîchie à un rythme plus lent que la section principale M, les erreurs de données apparaissant dans la section S sont détectées et les rythmes de rafraîchissement des deux sections sont ensuite réglés en maintenant un rythme de rafraîchissement de la section M plus élevé que celui de la section S par un facteur de sécurité, jusqu'à ce que les erreurs de données dans la section S soient insignifiantes.
Designated States: AT, AU, BB, BG, BR, CA, CH, DE, DK, ES, FI, GB, GR, HU, JP, KP, KR, LK, LU, MC, MG, MW, NL, NO, RO, SD, SE, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CM, GA, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0500696JPH05501628GB2239539AU1990067412