JPH04213137A - Data secrecy device memory module - Google Patents

Data secrecy device memory module

Info

Publication number
JPH04213137A
JPH04213137A JP40075690A JP40075690A JPH04213137A JP H04213137 A JPH04213137 A JP H04213137A JP 40075690 A JP40075690 A JP 40075690A JP 40075690 A JP40075690 A JP 40075690A JP H04213137 A JPH04213137 A JP H04213137A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
secrecy
data
time
writer
reader
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.)
Pending
Application number
JP40075690A
Inventor
Masahiro Kitatsume
Masakatsu Matsumoto
Original Assignee
Tokimec 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

Links

Abstract

PURPOSE: To protect a memory module from an illegal usage by operating a secrecy releasing control by using the first access information at the time of the power-on and start of a reader/writer, when the writing or reading of data for a nonvolatile memory is operated.
CONSTITUTION: The writing or reading of the data for an incorporated nonvolatile memory 20 is operated, according to the access from the electromagnetically guided and combined reader/writer. At that time, a secrecy circuit 100 successively compares a read command, address, and data as secrecy releasing information serially transferred by every one but from the pertinent reader/ writer to a control circuit 18 at the time of the power-on and start, from the first bit. The secrecy circuit 100 strops the comparison at the time of detecting a bit incoincidence, stops the operation of the nonvolatile memory 20, and prevents the memory access after that from being performed, when the data different from the preliminarily decided pertinent secrecy releasing information are transmitted.
COPYRIGHT: (C)1992,JPO&Japio
JP40075690A 1990-12-07 1990-12-07 Data secrecy device memory module Pending JPH04213137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP40075690A JPH04213137A (en) 1990-12-07 1990-12-07 Data secrecy device memory module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP40075690A JPH04213137A (en) 1990-12-07 1990-12-07 Data secrecy device memory module

Publications (1)

Publication Number Publication Date
JPH04213137A true true JPH04213137A (en) 1992-08-04

Family

ID=18510636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP40075690A Pending JPH04213137A (en) 1990-12-07 1990-12-07 Data secrecy device memory module

Country Status (1)

Country Link
JP (1) JPH04213137A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07200287A (en) * 1993-12-16 1995-08-04 Internatl Business Mach Corp <Ibm> Protected program type memory cartridge and computer system using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01184781A (en) * 1988-01-18 1989-07-24 Tokyo Keiki Co Ltd Memory package system
JPH0245850A (en) * 1988-08-08 1990-02-15 Nec Corp Non-volatile semiconductor memory

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01184781A (en) * 1988-01-18 1989-07-24 Tokyo Keiki Co Ltd Memory package system
JPH0245850A (en) * 1988-08-08 1990-02-15 Nec Corp Non-volatile semiconductor memory

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07200287A (en) * 1993-12-16 1995-08-04 Internatl Business Mach Corp <Ibm> Protected program type memory cartridge and computer system using the same

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