JPS55121525A - Priority control system of electronic computer system - Google Patents
Priority control system of electronic computer systemInfo
- Publication number
- JPS55121525A JPS55121525A JP2949779A JP2949779A JPS55121525A JP S55121525 A JPS55121525 A JP S55121525A JP 2949779 A JP2949779 A JP 2949779A JP 2949779 A JP2949779 A JP 2949779A JP S55121525 A JPS55121525 A JP S55121525A
- Authority
- JP
- Japan
- Prior art keywords
- priority
- units
- unit
- 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
Abstract
PURPOSE:To provide a system with flexibility and also to prevent a low-priority unit from queuing to use a bus foreover by making it possible to set a random unit through a program without the bus service priority among units unconditionally. CONSTITUTION:Various units 4 are connected to bus 3 via connection part 5, which is provided with priority control circuit 6. Additionally, priority decision circuit A is provided and timer unit 12 is suppied with a bus service request signal via control signal 8. Timer unit 12 counts the elapse time since the signal is inputted and sends its output to priority correcting circuit 14 via data path 13, and the existence of the bus service request is transferred to priority decision circuit 16 via signal line 15. Circuit 14 receives information about the elapse time and taht from block 19 stored with the priority among units 4 and then corrects the priority among units 4 according to the latency time of each unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2949779A JPS55121525A (en) | 1979-03-14 | 1979-03-14 | Priority control system of electronic computer system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2949779A JPS55121525A (en) | 1979-03-14 | 1979-03-14 | Priority control system of electronic computer system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55121525A true JPS55121525A (en) | 1980-09-18 |
Family
ID=12277703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2949779A Pending JPS55121525A (en) | 1979-03-14 | 1979-03-14 | Priority control system of electronic computer system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55121525A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914033A (en) * | 1982-07-14 | 1984-01-24 | Nec Corp | Peripheral control device |
JPS62214467A (en) * | 1986-03-17 | 1987-09-21 | Fujitsu Ltd | Multiprocessor instruction control system |
JPH1042278A (en) * | 1996-07-22 | 1998-02-13 | Canon Inc | Video input system, video input controller and method therefor |
JP2006040019A (en) * | 2004-07-28 | 2006-02-09 | Renesas Technology Corp | Access control unit |
-
1979
- 1979-03-14 JP JP2949779A patent/JPS55121525A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914033A (en) * | 1982-07-14 | 1984-01-24 | Nec Corp | Peripheral control device |
JPS62214467A (en) * | 1986-03-17 | 1987-09-21 | Fujitsu Ltd | Multiprocessor instruction control system |
JPH1042278A (en) * | 1996-07-22 | 1998-02-13 | Canon Inc | Video input system, video input controller and method therefor |
JP2006040019A (en) * | 2004-07-28 | 2006-02-09 | Renesas Technology Corp | Access control unit |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040315 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070731 |
|
A313 | Final decision of rejection without a dissenting response from the applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A313 Effective date: 20071219 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080129 |