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JPS6458007A - Clock correction system - Google Patents

Clock correction system

Info

Publication number
JPS6458007A
JPS6458007A JP62214667A JP21466787A JPS6458007A JP S6458007 A JPS6458007 A JP S6458007A JP 62214667 A JP62214667 A JP 62214667A JP 21466787 A JP21466787 A JP 21466787A JP S6458007 A JPS6458007 A JP S6458007A
Authority
JP
Japan
Prior art keywords
circuit
clock
units
loop
oscillation loop
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
JP62214667A
Other languages
Japanese (ja)
Other versions
JP2637738B2 (en
Inventor
Masao Inoue
Akira Yamagiwa
Toshihiro Okabe
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
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62214667A priority Critical patent/JP2637738B2/en
Publication of JPS6458007A publication Critical patent/JPS6458007A/en
Application granted granted Critical
Publication of JP2637738B2 publication Critical patent/JP2637738B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the clock skew caused between units and to increase the system working speed by adding a variable delay circuit into a clock signal distributing path reaching up to a load circuit from the input of a unit. CONSTITUTION:When an oscillation loop selecting signal is outputted from a service processor SVP4, an oscillation loop is formed in a unit 30 to return a selector circuit 7 via a variable delay circuit 8, a four-phase clock generating circuit 9, a clock distributing circuit 23a and a load circuit 24a. Then the output value of the oscillation loop is obtained to a fixed counting time of a reference clock for each of units 3b, 3c, etc. These loop count values are compared with each other. The circuit 8 is controlled so that the loop count values are equal to each other among those units.
JP62214667A 1987-08-28 1987-08-28 Clock correction method Expired - Lifetime JP2637738B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62214667A JP2637738B2 (en) 1987-08-28 1987-08-28 Clock correction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62214667A JP2637738B2 (en) 1987-08-28 1987-08-28 Clock correction method

Publications (2)

Publication Number Publication Date
JPS6458007A true JPS6458007A (en) 1989-03-06
JP2637738B2 JP2637738B2 (en) 1997-08-06

Family

ID=16659572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62214667A Expired - Lifetime JP2637738B2 (en) 1987-08-28 1987-08-28 Clock correction method

Country Status (1)

Country Link
JP (1) JP2637738B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04251312A (en) * 1991-01-08 1992-09-07 Hitachi Ltd Clock supplying system
JPH04267413A (en) * 1991-02-22 1992-09-24 Nec Corp Integrated circuit with built-in clock skew adjusting circuit
JPH04346111A (en) * 1991-05-23 1992-12-02 Nec Corp Integrated circuit
JPH05241679A (en) * 1992-03-03 1993-09-21 Nec Corp Integrated circuit incorporating clock skew adjustment circuit
US5329240A (en) * 1990-10-20 1994-07-12 Fujitsu Limited Apparatus for measuring clock pulse delay in one or more circuits
JP2009112028A (en) * 2008-12-09 2009-05-21 Epson Toyocom Corp Piezoelectric oscillator
JP2010528536A (en) * 2007-05-21 2010-08-19 クゥアルコム・インコーポレイテッド Method and apparatus for programmable delay with fine delay resolution

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59144927A (en) * 1983-02-07 1984-08-20 Nec Corp Adjusting circuit of timing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59144927A (en) * 1983-02-07 1984-08-20 Nec Corp Adjusting circuit of timing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329240A (en) * 1990-10-20 1994-07-12 Fujitsu Limited Apparatus for measuring clock pulse delay in one or more circuits
JPH04251312A (en) * 1991-01-08 1992-09-07 Hitachi Ltd Clock supplying system
JPH04267413A (en) * 1991-02-22 1992-09-24 Nec Corp Integrated circuit with built-in clock skew adjusting circuit
JPH04346111A (en) * 1991-05-23 1992-12-02 Nec Corp Integrated circuit
JPH05241679A (en) * 1992-03-03 1993-09-21 Nec Corp Integrated circuit incorporating clock skew adjustment circuit
JP2010528536A (en) * 2007-05-21 2010-08-19 クゥアルコム・インコーポレイテッド Method and apparatus for programmable delay with fine delay resolution
JP2009112028A (en) * 2008-12-09 2009-05-21 Epson Toyocom Corp Piezoelectric oscillator

Also Published As

Publication number Publication date
JP2637738B2 (en) 1997-08-06

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