JPS551675A - Memory protect control system - Google Patents
Memory protect control systemInfo
- Publication number
- JPS551675A JPS551675A JP7520878A JP7520878A JPS551675A JP S551675 A JPS551675 A JP S551675A JP 7520878 A JP7520878 A JP 7520878A JP 7520878 A JP7520878 A JP 7520878A JP S551675 A JPS551675 A JP S551675A
- Authority
- JP
- Japan
- Prior art keywords
- protect
- memory
- logical product
- register
- control 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.)
- Pending
Links
Abstract
PURPOSE: To simplify the memory protect control and to decrease the protect bit, by taking the logical product between the protect bit selected and the ouput of specified memory usage device, through setting the protect data from the memory usage device to the memory protect register.
CONSTITUTION: First, protect data is set to the protect register 1 from a given processor. Next, when memory is accessed, the address selector 2 selects the protect bit set to the protect register 1. The logical product between the protect bit selected and the output from the processor A or B, is taken at the AND circuit 3 or 4. When the logical product is taken, it is judged as protect error. The protect error is outputted through the OR circuit 5.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7520878A JPS551675A (en) | 1978-06-21 | 1978-06-21 | Memory protect control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7520878A JPS551675A (en) | 1978-06-21 | 1978-06-21 | Memory protect control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS551675A true JPS551675A (en) | 1980-01-08 |
Family
ID=13569538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7520878A Pending JPS551675A (en) | 1978-06-21 | 1978-06-21 | Memory protect control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS551675A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5992929U (en) * | 1982-12-09 | 1984-06-23 | 株式会社明電舎 | Memory monitoring device for DMA device |
-
1978
- 1978-06-21 JP JP7520878A patent/JPS551675A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5992929U (en) * | 1982-12-09 | 1984-06-23 | 株式会社明電舎 | Memory monitoring device for DMA device |
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