JPS55103657A - Priority circuit - Google Patents
Priority circuitInfo
- Publication number
- JPS55103657A JPS55103657A JP1145679A JP1145679A JPS55103657A JP S55103657 A JPS55103657 A JP S55103657A JP 1145679 A JP1145679 A JP 1145679A JP 1145679 A JP1145679 A JP 1145679A JP S55103657 A JPS55103657 A JP S55103657A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- priority level
- counter
- output
- circuits
- 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 process the processing request of a low priority level without considerably long-time queuing even in case that the processing request of a high priority level is continuous, by providing a priority level change circuit constituted by logical operation circuits.
CONSTITUTION: This circuit is constituted by priority level change circuit 1, queuing frequency counter circuits 3W6, etc. In case of no output from any counter of circuits 3W6, the output of circuit 1 is "0". While one of request display FFs 30W 31 of a high priority level is set continuously, the request of a processing request source to set FF33 is not accepted, and request acceptance FF53 is not set. Counter 23 counts queuing frequency for the request of a processing request source of the lowest priority level; and when the count value reaches a prescribed value, counter 23 generates the output to set the output of AND circuit 73 to "1". As the result, FF53 is set through OR circuit 83. Simultaneously, all AND circuits 10W13 are inhibited by the output of OR circuit 84, and acceptance of other processing requests is inhibited. When FF53 is set, counter 23 is reset to release inhibit of circuits 10W 13.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1145679A JPS55103657A (en) | 1979-02-05 | 1979-02-05 | Priority circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1145679A JPS55103657A (en) | 1979-02-05 | 1979-02-05 | Priority circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55103657A true JPS55103657A (en) | 1980-08-08 |
Family
ID=11778588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1145679A Pending JPS55103657A (en) | 1979-02-05 | 1979-02-05 | Priority circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55103657A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63269231A (en) * | 1987-04-27 | 1988-11-07 | Pfu Ltd | Interruption priority control system |
JPH02278341A (en) * | 1989-04-19 | 1990-11-14 | Nec Corp | Interruption control circuit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5063856A (en) * | 1973-10-08 | 1975-05-30 | ||
JPS5244136A (en) * | 1975-10-03 | 1977-04-06 | Hitachi Ltd | Preference-order control system |
JPS5323243A (en) * | 1976-08-13 | 1978-03-03 | Mitsubishi Electric Corp | Interruption control circuit |
JPS5384656A (en) * | 1976-12-30 | 1978-07-26 | Fujitsu Ltd | Precedence control system |
-
1979
- 1979-02-05 JP JP1145679A patent/JPS55103657A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5063856A (en) * | 1973-10-08 | 1975-05-30 | ||
JPS5244136A (en) * | 1975-10-03 | 1977-04-06 | Hitachi Ltd | Preference-order control system |
JPS5323243A (en) * | 1976-08-13 | 1978-03-03 | Mitsubishi Electric Corp | Interruption control circuit |
JPS5384656A (en) * | 1976-12-30 | 1978-07-26 | Fujitsu Ltd | Precedence control system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63269231A (en) * | 1987-04-27 | 1988-11-07 | Pfu Ltd | Interruption priority control system |
JPH02278341A (en) * | 1989-04-19 | 1990-11-14 | Nec Corp | Interruption control circuit |
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