JPS57111715A - Clock switching system - Google Patents

Clock switching system

Info

Publication number
JPS57111715A
JPS57111715A JP18786080A JP18786080A JPS57111715A JP S57111715 A JPS57111715 A JP S57111715A JP 18786080 A JP18786080 A JP 18786080A JP 18786080 A JP18786080 A JP 18786080A JP S57111715 A JPS57111715 A JP S57111715A
Authority
JP
Japan
Prior art keywords
clock
circuits
switching
signal
clock switching
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
JP18786080A
Other languages
Japanese (ja)
Inventor
Shuichi Tokunaga
Yasuo Ogasawara
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 JP18786080A priority Critical patent/JPS57111715A/en
Publication of JPS57111715A publication Critical patent/JPS57111715A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/04—Generating or distributing clock signals or signals derived directly therefrom

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

PURPOSE:To secure the continuity of clock pulses and form a clear signal before the clock is switched and facilitate reconstituting the system, by providing a clock switching control circuit where phases of clock pulses before switching and after switching are made continuous by an SR type FF circuit. CONSTITUTION:A data processing device for electronic exchange or the like of the dual constitution consists of a system CC0 and a system CC1, and systems CC0 and CC1 are provided with clock switching control circuits 12a and 12b, clock switching signal circuits 11a and 11b, and clock supplying circuits 5a and 5b having switching circuits 8a and 8b respectively. Circuits 12a and 12b are provided with SR type FF circuits to generate a clear signal, which clears a prescribed circuit of the data processing device, and a clock switching signal when the clock switching instruction is received. The clock switching signal is generated during the transmission of the clear signal, and clocks are switched by this switching signal, thus securing a continuous operation of the data processing device.
JP18786080A 1980-12-29 1980-12-29 Clock switching system Pending JPS57111715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18786080A JPS57111715A (en) 1980-12-29 1980-12-29 Clock switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18786080A JPS57111715A (en) 1980-12-29 1980-12-29 Clock switching system

Publications (1)

Publication Number Publication Date
JPS57111715A true JPS57111715A (en) 1982-07-12

Family

ID=16213474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18786080A Pending JPS57111715A (en) 1980-12-29 1980-12-29 Clock switching system

Country Status (1)

Country Link
JP (1) JPS57111715A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010830A (en) * 1983-06-29 1985-01-21 Fujitsu Ltd System switching system
JPS6095623A (en) * 1983-10-31 1985-05-29 Hitachi Ltd Information processing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010830A (en) * 1983-06-29 1985-01-21 Fujitsu Ltd System switching system
JPH034145B2 (en) * 1983-06-29 1991-01-22 Fujitsu Ltd
JPS6095623A (en) * 1983-10-31 1985-05-29 Hitachi Ltd Information processing system

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