JPS55103657A - Priority circuit - Google Patents

Priority circuit

Info

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
Application number
JP1145679A
Other languages
Japanese (ja)
Inventor
Yutaka Amano
Tadashi Nakanuma
Katsuji Horiguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP1145679A priority Critical patent/JPS55103657A/en
Publication of JPS55103657A publication Critical patent/JPS55103657A/en
Pending legal-status Critical Current

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
JP1145679A 1979-02-05 1979-02-05 Priority circuit Pending JPS55103657A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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