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JPS5456334A - Memory system - Google Patents

Memory system

Info

Publication number
JPS5456334A
JPS5456334A JP12251577A JP12251577A JPS5456334A JP S5456334 A JPS5456334 A JP S5456334A JP 12251577 A JP12251577 A JP 12251577A JP 12251577 A JP12251577 A JP 12251577A JP S5456334 A JPS5456334 A JP S5456334A
Authority
JP
Japan
Prior art keywords
rom
parity
units
words
exclusive
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
JP12251577A
Other languages
Japanese (ja)
Inventor
Kokei Kondo
Noriaki Matsuoka
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 JP12251577A priority Critical patent/JPS5456334A/en
Publication of JPS5456334A publication Critical patent/JPS5456334A/en
Pending legal-status Critical Current

Links

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

Abstract

PURPOSE: To enable the parity check by adding a small number of ROM and thus to enhance both the economical performance and the reliability.
CONSTITUTION: N-units of ROM are numbered from No.1 to No. N, and n-units of words in which a words in which a word is composed of M-bits are contained as the memory capacity. Therefore, ROM No. 1 can form n-units of vertical parity P1, and ROM No.2 can form parity P2 in the same way. Here, the ROM exclusive for the parity is prepared to collect all of vertical parity P1WPn and then to store them as shown in the diagrams. As a result, the memory capacity of ROM exclusive for the parity becmes N-words with one word composed of N-bits. Actually, 4 or 8 is used most frequently for the value of N, so 4 units or 8-units of ROM with the data put in contain one unit of ROM exclusive for the parity to be used as the unit of one memory system
COPYRIGHT: (C)1979,JPO&Japio
JP12251577A 1977-10-14 1977-10-14 Memory system Pending JPS5456334A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12251577A JPS5456334A (en) 1977-10-14 1977-10-14 Memory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12251577A JPS5456334A (en) 1977-10-14 1977-10-14 Memory system

Publications (1)

Publication Number Publication Date
JPS5456334A true JPS5456334A (en) 1979-05-07

Family

ID=14837751

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12251577A Pending JPS5456334A (en) 1977-10-14 1977-10-14 Memory system

Country Status (1)

Country Link
JP (1) JPS5456334A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917642A (en) * 1982-07-22 1984-01-28 Meidensha Electric Mfg Co Ltd Device for reading out parity data
JPS5917100U (en) * 1982-07-20 1984-02-01 株式会社明電舎 data writing device
JPS59200350A (en) * 1983-04-27 1984-11-13 Usac Electronics Ind Co Ltd Parity check device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917100U (en) * 1982-07-20 1984-02-01 株式会社明電舎 data writing device
JPS5917642A (en) * 1982-07-22 1984-01-28 Meidensha Electric Mfg Co Ltd Device for reading out parity data
JPS59200350A (en) * 1983-04-27 1984-11-13 Usac Electronics Ind Co Ltd Parity check device

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