JPS55121525A - Priority control system of electronic computer system - Google Patents

Priority control system of electronic computer system

Info

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
Application number
JP2949779A
Other languages
Japanese (ja)
Inventor
Nobuhiko Yamagami
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2949779A priority Critical patent/JPS55121525A/en
Publication of JPS55121525A publication Critical patent/JPS55121525A/en
Pending legal-status Critical Current

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.
JP2949779A 1979-03-14 1979-03-14 Priority control system of electronic computer system Pending JPS55121525A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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