JPS5534314A - Key memory system - Google Patents

Key memory system

Info

Publication number
JPS5534314A
JPS5534314A JP10608478A JP10608478A JPS5534314A JP S5534314 A JPS5534314 A JP S5534314A JP 10608478 A JP10608478 A JP 10608478A JP 10608478 A JP10608478 A JP 10608478A JP S5534314 A JPS5534314 A JP S5534314A
Authority
JP
Japan
Prior art keywords
bit
memory
key
page
memory system
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.)
Granted
Application number
JP10608478A
Other languages
Japanese (ja)
Other versions
JPS5847784B2 (en
Inventor
Akira Hattori
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP53106084A priority Critical patent/JPS5847784B2/en
Publication of JPS5534314A publication Critical patent/JPS5534314A/en
Publication of JPS5847784B2 publication Critical patent/JPS5847784B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Storage Device Security (AREA)
  • Memory System Of A Hierarchy Structure (AREA)

Abstract

PURPOSE: To produce the key memory system cheaply without lowering the performance thereof by accommodating the reference bit high in access number or the modification bit in the high speed buffer memory.
CONSTITUTION: The page from the external memory device is stored in the main memory portion 6. In the key memory portion 5, the memory protecting key information set correspondingly to the page is stored. This information comprises an access control bit, a fetch protecting bit, a reference bit and a change bit. The key buffer 4 is a memory which has higher speed and a smaller capacity and in which the reference bit relating to recently made access page and a change bit are memorized. In this manner, by accommodating the reference bit and the change bit high in the access number and renewing them, this system of all the key memory system can be formed costly without deteriorating the performance in comparison with the system in which all the key memory system is constructed by the high speed memory.
COPYRIGHT: (C)1980,JPO&Japio
JP53106084A 1978-08-30 1978-08-30 key storage system Expired JPS5847784B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53106084A JPS5847784B2 (en) 1978-08-30 1978-08-30 key storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53106084A JPS5847784B2 (en) 1978-08-30 1978-08-30 key storage system

Publications (2)

Publication Number Publication Date
JPS5534314A true JPS5534314A (en) 1980-03-10
JPS5847784B2 JPS5847784B2 (en) 1983-10-25

Family

ID=14424683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53106084A Expired JPS5847784B2 (en) 1978-08-30 1978-08-30 key storage system

Country Status (1)

Country Link
JP (1) JPS5847784B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58224492A (en) * 1982-06-24 1983-12-26 Toshiba Corp Method for controlling virtual memory
JPS60129860A (en) * 1983-12-19 1985-07-11 Hitachi Ltd Detection system for addressing exception
JPS6371570A (en) * 1986-09-15 1988-03-31 フアセツト・エンタープライゼス・インコーポレーテツド Engine starter
JPS6371571A (en) * 1986-09-15 1988-03-31 フアセツト・エンタープライゼス・インコーポレーテツド Starter gear device for engine
JPH03139746A (en) * 1989-10-26 1991-06-13 Mitsubishi Electric Corp Main storage device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504946A (en) * 1972-01-20 1975-01-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504946A (en) * 1972-01-20 1975-01-20

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58224492A (en) * 1982-06-24 1983-12-26 Toshiba Corp Method for controlling virtual memory
JPS60129860A (en) * 1983-12-19 1985-07-11 Hitachi Ltd Detection system for addressing exception
JPS6371570A (en) * 1986-09-15 1988-03-31 フアセツト・エンタープライゼス・インコーポレーテツド Engine starter
JPS6371571A (en) * 1986-09-15 1988-03-31 フアセツト・エンタープライゼス・インコーポレーテツド Starter gear device for engine
JPH03139746A (en) * 1989-10-26 1991-06-13 Mitsubishi Electric Corp Main storage device

Also Published As

Publication number Publication date
JPS5847784B2 (en) 1983-10-25

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