JPS57103198A - Storage protection system - Google Patents
Storage protection systemInfo
- Publication number
- JPS57103198A JPS57103198A JP17878180A JP17878180A JPS57103198A JP S57103198 A JPS57103198 A JP S57103198A JP 17878180 A JP17878180 A JP 17878180A JP 17878180 A JP17878180 A JP 17878180A JP S57103198 A JPS57103198 A JP S57103198A
- Authority
- JP
- Japan
- Prior art keywords
- key
- main memory
- memory
- protection
- psw3
- 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
Links
Abstract
PURPOSE: To shorten access time by constituting the contents of a key memory, provided corresponding to each divided block of a main memory, by pieces of read and write protection information which correspond to the address of the main memory and the protection key of a program state word.
CONSTITUTION: In a system which protects a main memory 1 by key memories 2' provided corresponding to divided blocks of the main memory 1, the contents of each key memory 2' are constituted by pieces of read and write protection signals F' and S' which correspond to the address signal ADD of the main memory 1 and the protection key of a program state word PSW3. For access to the key memory 2', the address ADD of the main memory and the protection key of the PSW3 are used. Thus, it is unnecessary to compare key information read out of the memory 2' and the protection key of the PSW3 during access to the main memory, so the access time is shortened.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17878180A JPS57103198A (en) | 1980-12-19 | 1980-12-19 | Storage protection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17878180A JPS57103198A (en) | 1980-12-19 | 1980-12-19 | Storage protection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57103198A true JPS57103198A (en) | 1982-06-26 |
Family
ID=16054515
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17878180A Pending JPS57103198A (en) | 1980-12-19 | 1980-12-19 | Storage protection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57103198A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6197761A (en) * | 1984-10-18 | 1986-05-16 | Mitsubishi Electric Corp | Memory protection system |
JPS61147305A (en) * | 1984-12-20 | 1986-07-05 | Amada Metoretsukusu:Kk | Program lock method of nc machine |
JPS6252637A (en) * | 1985-08-30 | 1987-03-07 | アドバンスト・マイクロ・デイバイシズ・インコ−ポレ−テツド | Digital processor control |
-
1980
- 1980-12-19 JP JP17878180A patent/JPS57103198A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6197761A (en) * | 1984-10-18 | 1986-05-16 | Mitsubishi Electric Corp | Memory protection system |
JPS61147305A (en) * | 1984-12-20 | 1986-07-05 | Amada Metoretsukusu:Kk | Program lock method of nc machine |
JPS6252637A (en) * | 1985-08-30 | 1987-03-07 | アドバンスト・マイクロ・デイバイシズ・インコ−ポレ−テツド | Digital processor control |
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