JPS54157045A - Memory unit - Google Patents

Memory unit

Info

Publication number
JPS54157045A
JPS54157045A JP6542778A JP6542778A JPS54157045A JP S54157045 A JPS54157045 A JP S54157045A JP 6542778 A JP6542778 A JP 6542778A JP 6542778 A JP6542778 A JP 6542778A JP S54157045 A JPS54157045 A JP S54157045A
Authority
JP
Japan
Prior art keywords
data
error correction
correction code
read
mode
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
JP6542778A
Other languages
Japanese (ja)
Inventor
Tomohito Shibata
Kanzo Noda
Shin Maeda
Masafumi Kubo
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
Panafacom Ltd
Original Assignee
Fujitsu Ltd
Panafacom 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, Panafacom Ltd filed Critical Fujitsu Ltd
Priority to JP6542778A priority Critical patent/JPS54157045A/en
Publication of JPS54157045A publication Critical patent/JPS54157045A/en
Pending legal-status Critical Current

Links

Landscapes

  • Detection And Correction Of Errors (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE: To use a memory efficiently by adding an error correction code to changed data and writing data with the error correction code added in case that the read mode is switched to the write mode.
CONSTITUTION: Data and an error correction code for correcting the error of data are stored in addresses of memory 1, and the read mode and the write mode are controlled and are switched by timing circuit 3 and are designated during the address designation period. Then, during the period when the read mode is designated, read-out data is corrected on a basis of the error correction code by error correction circuit 7, and data with the error corrected is changed by read register 8. Then, the error correction code is added to this changed data, and data with the error correction code added is written by partial write circuit 5 in case that the read mode is switched to the write mode. As a result, the memory can be used efficiently.
COPYRIGHT: (C)1979,JPO&Japio
JP6542778A 1978-05-31 1978-05-31 Memory unit Pending JPS54157045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6542778A JPS54157045A (en) 1978-05-31 1978-05-31 Memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6542778A JPS54157045A (en) 1978-05-31 1978-05-31 Memory unit

Publications (1)

Publication Number Publication Date
JPS54157045A true JPS54157045A (en) 1979-12-11

Family

ID=13286766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6542778A Pending JPS54157045A (en) 1978-05-31 1978-05-31 Memory unit

Country Status (1)

Country Link
JP (1) JPS54157045A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61112245A (en) * 1984-10-12 1986-05-30 Fujitsu Ltd Error detecting and correcting circuit
JPS6266354A (en) * 1985-09-18 1987-03-25 Nec Corp Storage device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5181531A (en) * 1975-01-16 1976-07-16 Fujitsu Ltd
JPS5298434A (en) * 1976-02-14 1977-08-18 Hitachi Ltd Correction for memory error

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5181531A (en) * 1975-01-16 1976-07-16 Fujitsu Ltd
JPS5298434A (en) * 1976-02-14 1977-08-18 Hitachi Ltd Correction for memory error

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61112245A (en) * 1984-10-12 1986-05-30 Fujitsu Ltd Error detecting and correcting circuit
JPH0137770B2 (en) * 1984-10-12 1989-08-09 Fujitsu Ltd
JPS6266354A (en) * 1985-09-18 1987-03-25 Nec Corp Storage device

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