JPS5534314A - Key memory system - Google Patents
Key memory systemInfo
- 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
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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS504946A (en) * | 1972-01-20 | 1975-01-20 |
-
1978
- 1978-08-30 JP JP53106084A patent/JPS5847784B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS504946A (en) * | 1972-01-20 | 1975-01-20 |
Cited By (5)
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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