JPS545330A - Memory protect circuit - Google Patents

Memory protect circuit

Info

Publication number
JPS545330A
JPS545330A JP6989977A JP6989977A JPS545330A JP S545330 A JPS545330 A JP S545330A JP 6989977 A JP6989977 A JP 6989977A JP 6989977 A JP6989977 A JP 6989977A JP S545330 A JPS545330 A JP S545330A
Authority
JP
Japan
Prior art keywords
protect circuit
memory protect
memory
high speed
main memory
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
JP6989977A
Other languages
Japanese (ja)
Inventor
Jinichi Sakurai
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6989977A priority Critical patent/JPS545330A/en
Publication of JPS545330A publication Critical patent/JPS545330A/en
Pending legal-status Critical Current

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  • Storage Device Security (AREA)

Abstract

PURPOSE: To obtain the circuit having higher reliability which can select the ra ge of protection with a simple constitution, by preparing high speed memories driven with the same address as the main memory, and by performing gate-control for the write-in instruction signal from the main memory with the output signal of the high speed memory.
COPYRIGHT: (C)1979,JPO&Japio
JP6989977A 1977-06-15 1977-06-15 Memory protect circuit Pending JPS545330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6989977A JPS545330A (en) 1977-06-15 1977-06-15 Memory protect circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6989977A JPS545330A (en) 1977-06-15 1977-06-15 Memory protect circuit

Publications (1)

Publication Number Publication Date
JPS545330A true JPS545330A (en) 1979-01-16

Family

ID=13415998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6989977A Pending JPS545330A (en) 1977-06-15 1977-06-15 Memory protect circuit

Country Status (1)

Country Link
JP (1) JPS545330A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654862A (en) * 1979-09-27 1981-05-15 Siemens Ag Signal processor
JPS595496A (en) * 1982-06-30 1984-01-12 Fujitsu Ltd Memory protect system
JPS5945567A (en) * 1982-09-08 1984-03-14 Hitachi Ltd Circuit for controlling writing in memory
JPS5986348A (en) * 1982-09-07 1984-05-18 ウエスターン　エレクトリック　カムパニー，インコーポレーテッド Integrated circuit element for holding secret of data code
JPS59148959A (en) * 1983-02-14 1984-08-25 Omron Tateisi Electronics Co Debugging device
JPS59152599A (en) * 1983-02-21 1984-08-31 Omron Tateisi Electronics Co Memory control circuit
JPS59160243A (en) * 1983-03-02 1984-09-10 Omron Tateisi Electronics Co Debugging device
JPS60178074A (en) * 1984-02-24 1985-09-12 Canon Inc Electronic appliance
JPS60239850A (en) * 1984-05-14 1985-11-28 Fuji Xerox Co Ltd Microprocessor system provided with no-break memory
JPS6246355A (en) * 1985-08-23 1987-02-28 Hitachi Micro Comput Eng Ltd Microcomputer
JPS6286407A (en) * 1985-10-11 1987-04-20 Omron Tateisi Electronics Co Programmable controller

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654862A (en) * 1979-09-27 1981-05-15 Siemens Ag Signal processor
JPS595496A (en) * 1982-06-30 1984-01-12 Fujitsu Ltd Memory protect system
JPS5986348A (en) * 1982-09-07 1984-05-18 ウエスターン　エレクトリック　カムパニー，インコーポレーテッド Integrated circuit element for holding secret of data code
JPH045298B2 (en) * 1982-09-07 1992-01-31
JPS5945567A (en) * 1982-09-08 1984-03-14 Hitachi Ltd Circuit for controlling writing in memory
JPS59148959A (en) * 1983-02-14 1984-08-25 Omron Tateisi Electronics Co Debugging device
JPS59152599A (en) * 1983-02-21 1984-08-31 Omron Tateisi Electronics Co Memory control circuit
JPS59160243A (en) * 1983-03-02 1984-09-10 Omron Tateisi Electronics Co Debugging device
JPS60178074A (en) * 1984-02-24 1985-09-12 Canon Inc Electronic appliance
JPS60239850A (en) * 1984-05-14 1985-11-28 Fuji Xerox Co Ltd Microprocessor system provided with no-break memory
JPS6246355A (en) * 1985-08-23 1987-02-28 Hitachi Micro Comput Eng Ltd Microcomputer
JPS6286407A (en) * 1985-10-11 1987-04-20 Omron Tateisi Electronics Co Programmable controller

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