MX9205634A - METHOD AND APPARATUS OF PRODUCTION AGAINST MEMORY WRITING. - Google Patents

METHOD AND APPARATUS OF PRODUCTION AGAINST MEMORY WRITING.

Info

Publication number
MX9205634A
MX9205634A MX9205634A MX9205634A MX9205634A MX 9205634 A MX9205634 A MX 9205634A MX 9205634 A MX9205634 A MX 9205634A MX 9205634 A MX9205634 A MX 9205634A MX 9205634 A MX9205634 A MX 9205634A
Authority
MX
Mexico
Prior art keywords
signal
generation
memory device
data
memory writing
Prior art date
Application number
MX9205634A
Other languages
Spanish (es)
Inventor
Francesco Rago
Terrie Frane
Lawrence D Cepuran
Dale Bengtson
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of MX9205634A publication Critical patent/MX9205634A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
    • G11C29/70—Masking faults in memories by using spares or by reconfiguring
    • G11C29/88—Masking faults in memories by using spares or by reconfiguring with partially good memories
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/004—Error avoidance
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
    • G11C7/22—Read-write [R-W] timing or clocking circuits; Read-write [R-W] control signal generators or management 
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
    • G11C7/24—Memory cell safety or protection circuits, e.g. arrangements for preventing inadvertent reading or writing; Status cells; Test cells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • 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
    • G06F11/0796—Safety measures, i.e. ensuring safe condition in the event of error, e.g. for controlling element

Abstract

2097308 9307565 PCTABS00021 A write protection apparatus is disclosed. The write protection apparatus couples a data supplying device (121) to the data input of a memory device (127). The memory protection device generates a first signal (211) which triggers generation of a second signal (215). The second signal (215) is active for a first predetermined time and is coupled to the input of the memory device (127). At any time during this first predetermined time, a third signal (209) may be generated. The third signal (209) inactivates the second signal. This third signal (209) may be triggered by numerous events including: generation of a read signal, generation of a chip select signal, or indication that the end of the data to be written to the memory device (127) has occurred.
MX9205634A 1991-10-01 1992-10-01 METHOD AND APPARATUS OF PRODUCTION AGAINST MEMORY WRITING. MX9205634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76989691A 1991-10-01 1991-10-01

Publications (1)

Publication Number Publication Date
MX9205634A true MX9205634A (en) 1993-04-01

Family

ID=25086828

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9205634A MX9205634A (en) 1991-10-01 1992-10-01 METHOD AND APPARATUS OF PRODUCTION AGAINST MEMORY WRITING.

Country Status (5)

Country Link
CA (1) CA2097308A1 (en)
FR (1) FR2681965A1 (en)
IT (1) IT1258856B (en)
MX (1) MX9205634A (en)
WO (1) WO1993007565A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6026293A (en) * 1996-09-05 2000-02-15 Ericsson Inc. System for preventing electronic memory tampering
JP4154006B2 (en) * 1996-12-25 2008-09-24 富士通株式会社 Semiconductor memory device
GB2356952B (en) * 1996-12-25 2001-07-25 Fujitsu Ltd Semiconductor memory device

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245344A (en) * 1979-04-02 1981-01-13 Rockwell International Corporation Processing system with dual buses
US4493031A (en) * 1982-08-25 1985-01-08 At&T Bell Laboratories Memory write protection using timers
JPS6124091A (en) * 1984-07-12 1986-02-01 Nec Corp Memory circuit
US4742469A (en) * 1985-10-31 1988-05-03 F.M.E. Corporation Electronic meter circuitry
US4816654A (en) * 1986-05-16 1989-03-28 American Telephone And Telegraph Company Improved security system for a portable data carrier
US4843385A (en) * 1986-07-02 1989-06-27 Motorola, Inc. Electronic lock system for a two-way radio
FR2608803B1 (en) * 1986-12-19 1991-10-25 Eurotechnique Sa DEVICE FOR PROTECTING AN ERASABLE AND REPROGRAMMABLE DEAD MEMORY
US5001670A (en) * 1987-02-06 1991-03-19 Tektronix, Inc. Nonvolatile memory protection
JPS63271679A (en) * 1987-04-30 1988-11-09 Toshiba Corp Data writing system
US4860341A (en) * 1987-06-02 1989-08-22 Motorola, Inc. Radiotelephone credit card call approval synchronization
US4970692A (en) * 1987-09-01 1990-11-13 Waferscale Integration, Inc. Circuit for controlling a flash EEPROM having three distinct modes of operation by allowing multiple functionality of a single pin
JPH0648838B2 (en) * 1988-07-18 1994-06-22 株式会社田村電機製作所 Public telephone
FI86922C (en) * 1990-01-05 1992-10-26 Raha Automaattiyhdistys FOERFARANDE OCH ANORDNING FOER KONTROLLERING AV INSKRIVNING I ETT MINNE

Also Published As

Publication number Publication date
IT1258856B (en) 1996-03-01
CA2097308A1 (en) 1993-04-02
ITRM920707A1 (en) 1994-03-28
FR2681965A1 (en) 1993-04-02
ITRM920707A0 (en) 1992-09-28
WO1993007565A1 (en) 1993-04-15

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