JPS55944A - Clock switching system - Google Patents

Clock switching system

Info

Publication number
JPS55944A
JPS55944A JP7396578A JP7396578A JPS55944A JP S55944 A JPS55944 A JP S55944A JP 7396578 A JP7396578 A JP 7396578A JP 7396578 A JP7396578 A JP 7396578A JP S55944 A JPS55944 A JP S55944A
Authority
JP
Japan
Prior art keywords
clock
circuit
clock switching
computers
same time
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.)
Granted
Application number
JP7396578A
Other languages
Japanese (ja)
Other versions
JPS5919373B2 (en
Inventor
Kazuo Mochizuki
Shigeki Furuta
Hideo Iyota
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP53073965A priority Critical patent/JPS5919373B2/en
Publication of JPS55944A publication Critical patent/JPS55944A/en
Publication of JPS5919373B2 publication Critical patent/JPS5919373B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To eliminate on the operation of a system with two computers even at the time of clock switching, by providing clock generating devices, clock assignment devices and clock switching circuits corresponding to computers.
CONSTITUTION: This clock switching system consists of clock generating devices 19A and 19B which correspond to computer systems A and B, service processors 13A and 13B which assign a device to be used, switching circuits 14A and 14B, and interface signal line 18. To switch device 19A to 19B while processors 13A and 13B are indicating device 19B, circuit 14A halts device 19A and also informs circuit 14B of that. Circuit 14B stops the operation from device 19A and starts the operation from device 19B, informing device 19A of that. Then circuits 14A and 14B stop clocks from device 19A at the same time and send out clocks from device 19B at the same time, thereby securing the operation of the system even in a swtiching mode.
COPYRIGHT: (C)1980,JPO&Japio
JP53073965A 1978-06-19 1978-06-19 Clock switching method Expired JPS5919373B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53073965A JPS5919373B2 (en) 1978-06-19 1978-06-19 Clock switching method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53073965A JPS5919373B2 (en) 1978-06-19 1978-06-19 Clock switching method

Publications (2)

Publication Number Publication Date
JPS55944A true JPS55944A (en) 1980-01-07
JPS5919373B2 JPS5919373B2 (en) 1984-05-04

Family

ID=13533289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53073965A Expired JPS5919373B2 (en) 1978-06-19 1978-06-19 Clock switching method

Country Status (1)

Country Link
JP (1) JPS5919373B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105016A (en) * 1980-12-22 1982-06-30 Nec Corp Clock source switching system
JPS57127366A (en) * 1981-01-30 1982-08-07 Sanyo Electric Co Ltd Horizontal afc circuit of television picture receiver
JPS57201848U (en) * 1981-06-17 1982-12-22
JPS6095623A (en) * 1983-10-31 1985-05-29 Hitachi Ltd Information processing system
JP2010205154A (en) * 2009-03-05 2010-09-16 Fujitsu Ltd Clock supply method and information processing apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105016A (en) * 1980-12-22 1982-06-30 Nec Corp Clock source switching system
JPS6250034B2 (en) * 1980-12-22 1987-10-22 Nippon Denki Kk
JPS57127366A (en) * 1981-01-30 1982-08-07 Sanyo Electric Co Ltd Horizontal afc circuit of television picture receiver
JPS6126873B2 (en) * 1981-01-30 1986-06-23 Sanyo Electric Co
JPS57201848U (en) * 1981-06-17 1982-12-22
JPS6228781Y2 (en) * 1981-06-17 1987-07-23
JPS6095623A (en) * 1983-10-31 1985-05-29 Hitachi Ltd Information processing system
JP2010205154A (en) * 2009-03-05 2010-09-16 Fujitsu Ltd Clock supply method and information processing apparatus

Also Published As

Publication number Publication date
JPS5919373B2 (en) 1984-05-04

Similar Documents

Publication Publication Date Title
JPS57201735A (en) Display device for vehicle
JPS55944A (en) Clock switching system
BE861297A (en) CIRCUIT SYSTEM FOR AN ELECTRONIC POWER SUPPLY DEVICE FOR SUBSCRIBER FACILITIES
JPS5685134A (en) Input/output controlling system for data processor
JPS53149739A (en) Computer system
JPS5741754A (en) System synchronizing system
JPS5371545A (en) Multiprocessor
JPS57164318A (en) Information processing system
JPS5316540A (en) Bus switching unit for electronic computer
JPS52107741A (en) Peripheral control unit
JPS5296834A (en) Electronic computer
JPS5447535A (en) Electronic computer systen
JPS5723132A (en) Acquisition system for priority right of interruption
JPS54105937A (en) Monitor system for electronic computer system
JPS56166522A (en) System power supply control device
JPS5313324A (en) Input/output device
JPS52112248A (en) Data distribution signal processing system
JPS5337366A (en) Driving system for semiconductor switch
JPS52102644A (en) Priority decision circuit
JPS51113432A (en) Input output control system
JPS57152004A (en) Synchronizer for multiplex computer
JPS54143035A (en) Queue overflow processing system
JPS53121543A (en) Check circuit
JPS5412235A (en) Connection switching unit of data terminal system
JPS5431241A (en) Circuit switching device