JPS55135954A - Common memory access system - Google Patents
Common memory access systemInfo
- Publication number
- JPS55135954A JPS55135954A JP4281579A JP4281579A JPS55135954A JP S55135954 A JPS55135954 A JP S55135954A JP 4281579 A JP4281579 A JP 4281579A JP 4281579 A JP4281579 A JP 4281579A JP S55135954 A JPS55135954 A JP S55135954A
- Authority
- JP
- Japan
- Prior art keywords
- common memory
- microcomputer
- parts
- memory part
- access
- 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 avoid the simultaneous access of the common memory part by making a microcomputer have its peculiar time limit, and also to make it possible to execute a peculiar program in case several computers access the common memory at the same time.
CONSTITUTION: In case the common memory part 104 is accessed by use of a microcomputer 101 and a microcomputer 102, the bus changeover part 103 is provided in the bus 105 by which the digital parts 111 and 121 of the respective computers 102 and 102, and the digital output parts 112 and 122 are connected, and to this changeover part 103 is connected the common memory part 104. Moreover, the respective input parts 111 and 121 and the output parts 112 and 122 are connected each other in order to mutually watch the input and output status of the respective computers 101 and 102, therefore it is possible to avoid the simultaneous access of the same program of the common memory part 104, and to start execution of a peculiar program without an access time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4281579A JPS55135954A (en) | 1979-04-09 | 1979-04-09 | Common memory access system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4281579A JPS55135954A (en) | 1979-04-09 | 1979-04-09 | Common memory access system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55135954A true JPS55135954A (en) | 1980-10-23 |
Family
ID=12646437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4281579A Pending JPS55135954A (en) | 1979-04-09 | 1979-04-09 | Common memory access system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55135954A (en) |
-
1979
- 1979-04-09 JP JP4281579A patent/JPS55135954A/en active Pending
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