WO1990003611A3 - Computer memory backup system - Google Patents

Computer memory backup system Download PDF

Info

Publication number
WO1990003611A3
WO1990003611A3 PCT/GB1989/001117 GB8901117W WO9003611A3 WO 1990003611 A3 WO1990003611 A3 WO 1990003611A3 GB 8901117 W GB8901117 W GB 8901117W WO 9003611 A3 WO9003611 A3 WO 9003611A3
Authority
WO
WIPO (PCT)
Prior art keywords
computer
signal
backup
processing unit
central processing
Prior art date
Application number
PCT/GB1989/001117
Other languages
French (fr)
Other versions
WO1990003611A2 (en
Inventor
Henry Jamieson Riddoch
Neal George Stewart
Gordon Dall
Original Assignee
Henry Jamieson Riddoch
Neal George Stewart
Gordon Dall
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB888822373A external-priority patent/GB8822373D0/en
Application filed by Henry Jamieson Riddoch, Neal George Stewart, Gordon Dall filed Critical Henry Jamieson Riddoch
Publication of WO1990003611A2 publication Critical patent/WO1990003611A2/en
Publication of WO1990003611A3 publication Critical patent/WO1990003611A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1441—Resetting or repowering
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements

Abstract

A computer memory backup device (25) for a computer (10), wherein the computer (10) includes a volatile random access memory (RAM) (13), a nonvolatile memory device (15), a central processing unit (11), and a main power source (20) for converting external power into one or more DC voltage levels needed by the computer. The device (25) comprises a backup DC power source (50), including batteries in one embodiment, and control logic (30) for detecting a drop in external power level below a predetermined minimum and for outputting a first signal in response to said detected drop. A switching means (40) acts responsive to the first signal to couple the backup DC power source (50) to the volatile RAM (13), nonvolatile memory device (15), and central processing unit (11). Control logic (30) acts responsive to the first signal to direct the central processing unit (11) to store the contents of the computer's open data files and volatile RAM (13) in the nonvolatile memory device (15), and to output a second signal indicating that this storage function is complete. Switching means (40) acts responsive to the second signal to decouple said backup DC power source (50) from the central processing unit (11), the volatile RAM (13), and the nonvolatile storage device (15). The device (25) re-establishes the state of the computer's volatile RAM (15) and open data files once the power level is restored after the detected drop. A discriminator circuit (55) may also be included for recognizing write-only code data to one of a plurality of peripheral devices (24). The discriminator (55) stores the addresses of the write only data of the peripheral devices (24) and the data stored at each address for later recall when the power level is restored.
PCT/GB1989/001117 1988-09-23 1989-09-22 Computer memory backup system WO1990003611A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888822373A GB8822373D0 (en) 1988-09-23 1988-09-23 Memory back-up device & method
GB8822373.0 1988-09-23
US32334189A 1989-03-14 1989-03-14
US323,341 1989-03-14

Publications (2)

Publication Number Publication Date
WO1990003611A2 WO1990003611A2 (en) 1990-04-05
WO1990003611A3 true WO1990003611A3 (en) 1990-04-19

Family

ID=26294429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001117 WO1990003611A2 (en) 1988-09-23 1989-09-22 Computer memory backup system

Country Status (3)

Country Link
EP (1) EP0426764A1 (en)
JP (1) JPH03502144A (en)
WO (1) WO1990003611A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3087451B2 (en) * 1992-06-10 2000-09-11 富士通株式会社 Backup power control method
KR950013264B1 (en) * 1993-01-12 1995-10-26 허명석 Automatic back-up and recovery device and method in computer systems
US7512825B2 (en) * 2004-09-27 2009-03-31 Hewlett-Packard Development Company, L.P. Responding to DC power degradation
CN106528457B (en) * 2015-09-09 2020-05-29 施耐德电器工业公司 Programmable logic controller and method for preserving data during power failure thereof
US10401935B2 (en) 2016-05-03 2019-09-03 Samsung Electronics Co., Ltd. Storage device with a power source and persistent store that provides backup power to DRAM in a power loss event

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1178653A (en) * 1967-08-04 1970-01-21 Ibm Apparatus for Protecting Data Signals in Data Processing Equipment
US4307455A (en) * 1978-02-27 1981-12-22 Rockwell International Corporation Power supply for computing means with data protected shut-down

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58205994A (en) * 1982-05-25 1983-12-01 Mitsubishi Electric Corp Non-volatile memory system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1178653A (en) * 1967-08-04 1970-01-21 Ibm Apparatus for Protecting Data Signals in Data Processing Equipment
US4307455A (en) * 1978-02-27 1981-12-22 Rockwell International Corporation Power supply for computing means with data protected shut-down

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Vol. 17, No. 12, May 1975 (New York, US) R.S. CAPOWSKI et al.: "Data Retention System", pages 3660-3661 *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 58, (P-261) 16 March 1984; & JP, A, 58 205 994 (Mitsubishi Denki K.K.) 1 December 1983, see Abstract *

Also Published As

Publication number Publication date
EP0426764A1 (en) 1991-05-15
JPH03502144A (en) 1991-05-16
WO1990003611A2 (en) 1990-04-05

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