JPS55134462A - Memory control unit - Google Patents

Memory control unit

Info

Publication number
JPS55134462A
JPS55134462A JP4226779A JP4226779A JPS55134462A JP S55134462 A JPS55134462 A JP S55134462A JP 4226779 A JP4226779 A JP 4226779A JP 4226779 A JP4226779 A JP 4226779A JP S55134462 A JPS55134462 A JP S55134462A
Authority
JP
Japan
Prior art keywords
comparison
unit
control part
register
data
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
JP4226779A
Other languages
Japanese (ja)
Other versions
JPS6329296B2 (en
Inventor
Masanobu Akagi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4226779A priority Critical patent/JPS55134462A/en
Publication of JPS55134462A publication Critical patent/JPS55134462A/en
Publication of JPS6329296B2 publication Critical patent/JPS6329296B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To make it possible to omit a memory lock mechanism, by providing a comparison data register, a comparison exchange control part and a comparator to make it possible to control the operation of test and set.
CONSTITUTION: When detecting that contents of register 311 are the comparison exchange command, comparison exchange control part 330 not only continues to send address information of contents of register 312 to memory unit 40 but also transmits the code or read request to bus 330-1. Unit 40 performs the read operation on the basis of read request given by bus 30-1. Read data is sent to processing unit 10 and is transferred to comparator 350 and is compared with write data from unit 10 which is set in comparison data register 314. Control part 330 terminates the operation if the comparison result of comparator 350 indicates disagreement, and control part 330 performs the write operation to unit 40 for update of lock data continuously after the first read operation if they agree with each other.
COPYRIGHT: (C)1980,JPO&Japio
JP4226779A 1979-04-06 1979-04-06 Memory control unit Granted JPS55134462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4226779A JPS55134462A (en) 1979-04-06 1979-04-06 Memory control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4226779A JPS55134462A (en) 1979-04-06 1979-04-06 Memory control unit

Publications (2)

Publication Number Publication Date
JPS55134462A true JPS55134462A (en) 1980-10-20
JPS6329296B2 JPS6329296B2 (en) 1988-06-13

Family

ID=12631255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4226779A Granted JPS55134462A (en) 1979-04-06 1979-04-06 Memory control unit

Country Status (1)

Country Link
JP (1) JPS55134462A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6267648A (en) * 1985-09-19 1987-03-27 Fujitsu Ltd Processing system for exclusive control instruction
JPS63286959A (en) * 1987-05-20 1988-11-24 Fujitsu Ltd Memory access system
JPS6446867A (en) * 1987-08-17 1989-02-21 Fujitsu Ltd Memory access system
JPH02193228A (en) * 1989-01-23 1990-07-30 Canon Inc Information processor
JPH03231337A (en) * 1990-02-07 1991-10-15 Fujitsu Ltd Collection processing system for system execution history

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507951B1 (en) * 1990-09-18 1999-03-03 Fujitsu Limited Exclusive control method for shared memory

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318348A (en) * 1976-08-03 1978-02-20 Hitachi Ltd Access system of common area
JPS5336441A (en) * 1976-09-17 1978-04-04 Hitachi Ltd Test and setting system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318348A (en) * 1976-08-03 1978-02-20 Hitachi Ltd Access system of common area
JPS5336441A (en) * 1976-09-17 1978-04-04 Hitachi Ltd Test and setting system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6267648A (en) * 1985-09-19 1987-03-27 Fujitsu Ltd Processing system for exclusive control instruction
JPS63286959A (en) * 1987-05-20 1988-11-24 Fujitsu Ltd Memory access system
JPS6446867A (en) * 1987-08-17 1989-02-21 Fujitsu Ltd Memory access system
JPH02193228A (en) * 1989-01-23 1990-07-30 Canon Inc Information processor
JPH03231337A (en) * 1990-02-07 1991-10-15 Fujitsu Ltd Collection processing system for system execution history

Also Published As

Publication number Publication date
JPS6329296B2 (en) 1988-06-13

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