CA2070986A1 - Method and apparatus for controlling writing to memory - Google Patents

Method and apparatus for controlling writing to memory

Info

Publication number
CA2070986A1
CA2070986A1 CA002070986A CA2070986A CA2070986A1 CA 2070986 A1 CA2070986 A1 CA 2070986A1 CA 002070986 A CA002070986 A CA 002070986A CA 2070986 A CA2070986 A CA 2070986A CA 2070986 A1 CA2070986 A1 CA 2070986A1
Authority
CA
Canada
Prior art keywords
memory
key code
write operation
writing
control means
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
CA002070986A
Other languages
English (en)
French (fr)
Inventor
Jouko Laatikainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raha Automaattiyhdistys
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of CA2070986A1 publication Critical patent/CA2070986A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C8/00Arrangements for selecting an address in a digital store
    • G11C8/20Address safety or protection circuits, i.e. arrangements for preventing unauthorized or accidental access
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14Protection against unauthorised use of memory or access to memory
    • G06F12/1416Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights
    • G06F12/1425Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights the protection being physical, e.g. cell, word, block
    • G06F12/1433Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights the protection being physical, e.g. cell, word, block for a module or a part of a module
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C7/00Arrangements for writing information into, or reading information out from, a digital store
    • G11C7/24Memory cell safety or protection circuits, e.g. arrangements for preventing inadvertent reading or writing; Status cells; Test cells
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C8/00Arrangements for selecting an address in a digital store
    • G11C8/18Address timing or clocking circuits; Address control signal generation or management, e.g. for row address strobe [RAS] or column address strobe [CAS] signals
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751Error or fault detection not based on redundancy
    • G06F11/0754Error or fault detection not based on redundancy by exceeding limits
    • G06F11/0757Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Storage Device Security (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
CA002070986A 1990-01-05 1991-01-02 Method and apparatus for controlling writing to memory Abandoned CA2070986A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI900063A FI86922C (fi) 1990-01-05 1990-01-05 Foerfarande och anordning foer kontrollering av inskrivning i ett minne
FI900063 1990-01-05

Publications (1)

Publication Number Publication Date
CA2070986A1 true CA2070986A1 (en) 1991-07-06

Family

ID=8529649

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002070986A Abandoned CA2070986A1 (en) 1990-01-05 1991-01-02 Method and apparatus for controlling writing to memory

Country Status (9)

Country Link
EP (1) EP0507811A1 (fi)
JP (1) JPH05502957A (fi)
AU (1) AU640442B2 (fi)
CA (1) CA2070986A1 (fi)
FI (1) FI86922C (fi)
HU (1) HU207593B (fi)
NO (1) NO922652D0 (fi)
PL (1) PL292013A1 (fi)
WO (1) WO1991010192A1 (fi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2097308A1 (en) * 1991-10-01 1993-04-02 Terrie Frane Memory write protection method and apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493031A (en) * 1982-08-25 1985-01-08 At&T Bell Laboratories Memory write protection using timers
DE3325887A1 (de) * 1983-07-19 1985-01-31 Bosch Gmbh Robert Verfahren und vorrichtung zum schutz der mittels einer tastatur in einen ram-speicher eingegebenen informationen
US4796235A (en) * 1987-07-22 1989-01-03 Motorola, Inc. Write protect mechanism for non-volatile memory

Also Published As

Publication number Publication date
PL292013A1 (en) 1992-03-23
JPH05502957A (ja) 1993-05-20
FI900063A0 (fi) 1990-01-05
HU207593B (en) 1993-04-28
FI900063A (fi) 1991-07-06
EP0507811A1 (en) 1992-10-14
HUT61109A (en) 1992-11-30
AU640442B2 (en) 1993-08-26
FI86922B (fi) 1992-07-15
AU6973891A (en) 1991-07-24
NO922652L (no) 1992-07-03
WO1991010192A1 (en) 1991-07-11
NO922652D0 (no) 1992-07-03
FI86922C (fi) 1992-10-26
HU9202106D0 (en) 1992-10-28

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Legal Events

Date Code Title Description
FZDE Discontinued