JPS5582330A - Common bus control unit - Google Patents
Common bus control unitInfo
- Publication number
- JPS5582330A JPS5582330A JP15491778A JP15491778A JPS5582330A JP S5582330 A JPS5582330 A JP S5582330A JP 15491778 A JP15491778 A JP 15491778A JP 15491778 A JP15491778 A JP 15491778A JP S5582330 A JPS5582330 A JP S5582330A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- μcm
- common bus
- bus
- circuit
- 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
Landscapes
- Bus Control (AREA)
- Debugging And Monitoring (AREA)
- Multi Processors (AREA)
Abstract
PURPOSE: To make it possible to secure the use of a bus even for a low-priority μCM, by providing the bus request signal of plural microcomputers μCN which are connected to a common bus, in two stages.
CONSTITUTION: Plural μCMs 101W104 are connected to a common bus connected to a memory unit, an I/O, etc., and each μCM is provided with an interface control circuit which controls the use of the common bus. Common bus use request signal RQ for access from a μCM to the memory unit is outputted to priority control circuit 105, and bus use permission signal AC is returned to the μCM for this request. When the common bus is used, output signal FR of the μCM becomes 0. When signal AC is not returned over a fixed time after transmission of signal RQ, is signal TQ is generated by the μCM and is inputted to priority control circuit 106. Then, output EO of circuit 106 becomes 0, input EI of circuit 105 becomes 0, signal TQ is outputted to circuit 106, and the bus use is permitted only for the μCM which receives return signal TA.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15491778A JPS5582330A (en) | 1978-12-18 | 1978-12-18 | Common bus control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15491778A JPS5582330A (en) | 1978-12-18 | 1978-12-18 | Common bus control unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5582330A true JPS5582330A (en) | 1980-06-21 |
Family
ID=15594774
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15491778A Pending JPS5582330A (en) | 1978-12-18 | 1978-12-18 | Common bus control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5582330A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5866446U (en) * | 1981-10-29 | 1983-05-06 | 日本電気株式会社 | Abnormal convergence detection device |
JPH0579024A (en) * | 1991-09-13 | 1993-03-30 | Nippon Kaijo Koji Kk | Asphalt mat |
-
1978
- 1978-12-18 JP JP15491778A patent/JPS5582330A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5866446U (en) * | 1981-10-29 | 1983-05-06 | 日本電気株式会社 | Abnormal convergence detection device |
JPS6225795Y2 (en) * | 1981-10-29 | 1987-07-01 | ||
JPH0579024A (en) * | 1991-09-13 | 1993-03-30 | Nippon Kaijo Koji Kk | Asphalt mat |
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