CA1286413C - Method and apparatus for a constant frequency clock source in phase with a variable frequency system clock - Google Patents

Method and apparatus for a constant frequency clock source in phase with a variable frequency system clock

Info

Publication number
CA1286413C
CA1286413C CA000528350A CA528350A CA1286413C CA 1286413 C CA1286413 C CA 1286413C CA 000528350 A CA000528350 A CA 000528350A CA 528350 A CA528350 A CA 528350A CA 1286413 C CA1286413 C CA 1286413C
Authority
CA
Canada
Prior art keywords
signals
count
system clock
frequency
constant frequency
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.)
Expired - Fee Related
Application number
CA000528350A
Other languages
English (en)
French (fr)
Inventor
Robert T. Silver
William A. Samaras
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.)
Digital Equipment Corp
Original Assignee
Digital Equipment 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 Digital Equipment Corp filed Critical Digital Equipment Corp
Application granted granted Critical
Publication of CA1286413C publication Critical patent/CA1286413C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F1/12—Synchronisation of different clock signals provided by a plurality of clock generators
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F1/14—Time supervision arrangements, e.g. real time clock
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/68—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers using pulse rate multipliers or dividers pulse rate multipliers or dividers per se

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
CA000528350A 1986-01-29 1987-01-28 Method and apparatus for a constant frequency clock source in phase with a variable frequency system clock Expired - Fee Related CA1286413C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/823,729 US4748644A (en) 1986-01-29 1986-01-29 Method and apparatus for a constant frequency clock source in phase with a variable frequency system clock
US823,729 1986-01-29

Publications (1)

Publication Number Publication Date
CA1286413C true CA1286413C (en) 1991-07-16

Family

ID=25239563

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000528350A Expired - Fee Related CA1286413C (en) 1986-01-29 1987-01-28 Method and apparatus for a constant frequency clock source in phase with a variable frequency system clock

Country Status (6)

Country Link
US (1) US4748644A (en, 2012)
EP (1) EP0292502B1 (en, 2012)
JP (1) JPS63503412A (en, 2012)
AU (1) AU7082287A (en, 2012)
CA (1) CA1286413C (en, 2012)
WO (1) WO1987004813A1 (en, 2012)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3719582C2 (de) * 1987-06-12 1999-01-28 Philips Broadcast Television S Schaltungsanordnung zur Erzeugung eines Phasenreferenzsignals
US4849998A (en) * 1988-06-03 1989-07-18 Communications Satellite Corporation Rate synchronized symbol timing recovery for variable rate data transmission systems
GB2228598A (en) * 1989-02-28 1990-08-29 Ibm Clock signal generator for a data processing system
GB8906093D0 (en) * 1989-03-16 1989-04-26 British Telecomm Optical transmission system
US4972442A (en) * 1989-04-27 1990-11-20 Northern Telecom Limited Phase-locked loop clock
US4972160A (en) * 1989-12-07 1990-11-20 Northern Telecom Limited Phase-lock loop circuit with improved output signal jitter performance
JPH04371024A (ja) * 1991-06-19 1992-12-24 Sony Corp Ｐｌｌ周波数シンセサイザ
FR2680058B1 (fr) * 1991-07-30 1994-01-28 Sgs Thomson Microelectronics Sa Procede et dispositif de synchronisation d'un signal.
EP0686917A1 (en) * 1994-06-07 1995-12-13 International Business Machines Corporation Apparatus for processing a series of timing signals
JPH07336784A (ja) * 1994-06-08 1995-12-22 Toshiba Corp クロック同期装置
JP2817676B2 (ja) * 1995-07-31 1998-10-30 日本電気株式会社 Ｐｌｌ周波数シンセサイザ
KR100193806B1 (ko) * 1995-10-13 1999-06-15 윤종용 교환시스템의 클럭 발생회로 및 방법
US5784332A (en) * 1996-12-12 1998-07-21 Micron Technology Corporation Clock frequency detector for a synchronous memory device
US6172935B1 (en) 1997-04-25 2001-01-09 Micron Technology, Inc. Synchronous dynamic random access memory device
US7397314B2 (en) * 2002-09-11 2008-07-08 Hewlett-Packard Development Company, L.P. Redundant clock source
JP4624928B2 (ja) * 2006-01-12 2011-02-02 ルネサスエレクトロニクス株式会社 半導体集積回路装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3621451A (en) * 1969-02-26 1971-11-16 Hewlett Packard Co Frequency multiplier
JPS4999260A (en, 2012) * 1973-01-26 1974-09-19
US4030045A (en) * 1976-07-06 1977-06-14 International Telephone And Telegraph Corporation Digital double differential phase-locked loop
WO1985002275A1 (en) * 1983-11-07 1985-05-23 Motorola, Inc. Synthesized clock microcomputer with power saving

Also Published As

Publication number Publication date
AU7082287A (en) 1987-08-25
US4748644A (en) 1988-05-31
WO1987004813A1 (en) 1987-08-13
EP0292502A1 (en) 1988-11-30
JPS63503412A (ja) 1988-12-08
EP0292502B1 (en) 1990-05-23
JPH0437446B2 (en, 2012) 1992-06-19

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