JPS55121553A - Priority control system of electronic computer system - Google Patents
Priority control system of electronic computer systemInfo
- Publication number
- JPS55121553A JPS55121553A JP2949879A JP2949879A JPS55121553A JP S55121553 A JPS55121553 A JP S55121553A JP 2949879 A JP2949879 A JP 2949879A JP 2949879 A JP2949879 A JP 2949879A JP S55121553 A JPS55121553 A JP S55121553A
- Authority
- JP
- Japan
- Prior art keywords
- priority
- unit
- service request
- 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 make higher the priority of a unit, which is disallowed to use a bus for a long time after sending a service request, according to its latency time, by providing a system with flexibility by making it possible to set free the bus service priority among various unit without deciding on it unconditionally.
CONSTITUTION: Timer unit 12, provided inside priority decision circuit A, is supplied with a bus service request signal from priority control circuit 6 of various units 4 via control signal line 8. Unit 12 counts the elapse time since the bus service request signal and transfers information on it to priority correcting circuit 14 via data path 13 while transferring the existence of a bus service request from various unit 4 to priority decision circuit 16 via signal line 15. On the basis of information on the priority determined by circuit 14 and the elapse time from unit 12, circuit 16 sends a bus service request signal and then finds one of the units with the highest priority and to output its discrimination code while allowing it to use the bus by transferring a trigger signal to the unit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2949879A JPS55121553A (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 |
---|---|---|---|
JP2949879A JPS55121553A (en) | 1979-03-14 | 1979-03-14 | Priority control system of electronic computer system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55121553A true JPS55121553A (en) | 1980-09-18 |
Family
ID=12277734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2949879A Pending JPS55121553A (en) | 1979-03-14 | 1979-03-14 | Priority control system of electronic computer system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55121553A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02110651A (en) * | 1988-10-19 | 1990-04-23 | Pfu Ltd | Bus priority changing processing system |
-
1979
- 1979-03-14 JP JP2949879A patent/JPS55121553A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02110651A (en) * | 1988-10-19 | 1990-04-23 | Pfu Ltd | Bus priority changing processing system |
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