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GB2016758A - Checking Memories - Google Patents

Checking Memories

Info

Publication number
GB2016758A
GB2016758A GB7907712A GB7907712A GB2016758A GB 2016758 A GB2016758 A GB 2016758A GB 7907712 A GB7907712 A GB 7907712A GB 7907712 A GB7907712 A GB 7907712A GB 2016758 A GB2016758 A GB 2016758A
Authority
GB
United Kingdom
Prior art keywords
words
memory
data
memory check
effected
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
GB7907712A
Other versions
GB2016758B (en
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.)
Fanuc Corp
Original Assignee
Fujitsu Fanuc 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 Fanuc Ltd filed Critical Fujitsu Fanuc Ltd
Publication of GB2016758A publication Critical patent/GB2016758A/en
Application granted granted Critical
Publication of GB2016758B publication Critical patent/GB2016758B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Detection And Correction Of Errors (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

Storage of data words in a memory (MEM) takes place in terms of data blocks (BL1, BL2 etc) and storage of memory check words (A1, A2 etc) which relate to respective data blocks is also provided in the memory. Memory check is effected by reading out the data words of a data block (BL), performing a predetermined arithmetic/logic operation on those words and comparing the result with the memory check word (A) relating to the data block (BL). For example, if the memory check word (A) agrees with the result the read out words are taken to be error free, if there is no agreement the read out words are taken to contain an error. Economy in hardware can be effected since a separate parity check circuit is not required. <IMAGE>
GB7907712A 1978-03-06 1979-03-05 Checking memories Expired GB2016758B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2510678A JPS54117641A (en) 1978-03-06 1978-03-06 Memory inspecting system

Publications (2)

Publication Number Publication Date
GB2016758A true GB2016758A (en) 1979-09-26
GB2016758B GB2016758B (en) 1982-10-06

Family

ID=12156663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7907712A Expired GB2016758B (en) 1978-03-06 1979-03-05 Checking memories

Country Status (4)

Country Link
JP (1) JPS54117641A (en)
DE (1) DE2906789A1 (en)
FR (1) FR2419564A1 (en)
GB (1) GB2016758B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070184A2 (en) * 1981-07-13 1983-01-19 Fanuc Ltd. A method of testing memory
WO2006108849A1 (en) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Method and computer unit for error recognition and error logging in a memory

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55105897A (en) * 1979-01-31 1980-08-13 Hitachi Koki Co Ltd Memory device
DE2939461C2 (en) * 1979-09-28 1989-07-20 Siemens AG, 1000 Berlin und 8000 München Method for determining data disturbances in memories
JPS5683898A (en) * 1979-12-12 1981-07-08 Casio Comput Co Ltd Prom error detection system
JPS56101700A (en) * 1980-01-14 1981-08-14 Meidensha Electric Mfg Co Ltd Rom fault diagnostic system
JPS56147249A (en) * 1980-04-18 1981-11-16 Fujitsu Ltd Self-diagnostic processing system for unit made into firmware
US4442501A (en) * 1981-02-26 1984-04-10 Pitney Bowes Inc. Electronic postage meter with weak memory indication
JPS59178695A (en) * 1983-03-30 1984-10-09 Nittan Co Ltd Checking device of read-only memory
JPS6030000A (en) * 1983-07-27 1985-02-15 Mitsubishi Electric Corp Semiconductor memory device
JPS62117651U (en) * 1986-01-17 1987-07-25
DE4230615C2 (en) * 1992-09-12 2002-05-08 Bosch Gmbh Robert Process for the safe storage of data in non-volatile, overwritable memories and installation for carrying out the process
USD740125S1 (en) * 2014-03-26 2015-10-06 Gk Packaging, Inc. Bottle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5432232A (en) * 1977-08-17 1979-03-09 Toshiba Corp Check system for memory unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070184A2 (en) * 1981-07-13 1983-01-19 Fanuc Ltd. A method of testing memory
EP0070184A3 (en) * 1981-07-13 1985-06-12 Fanuc Ltd A method of, and apparatus for, testing memory
WO2006108849A1 (en) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Method and computer unit for error recognition and error logging in a memory
US8196026B2 (en) 2005-04-12 2012-06-05 Robert Bosch Gmbh Method and computer unit for error detection and logging in a memory

Also Published As

Publication number Publication date
DE2906789A1 (en) 1979-09-13
FR2419564A1 (en) 1979-10-05
JPS54117641A (en) 1979-09-12
GB2016758B (en) 1982-10-06
DE2906789B2 (en) 1980-05-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee