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JPS5567999A - Memory unit - Google Patents

Memory unit

Info

Publication number
JPS5567999A
JPS5567999A JP14034978A JP14034978A JPS5567999A JP S5567999 A JPS5567999 A JP S5567999A JP 14034978 A JP14034978 A JP 14034978A JP 14034978 A JP14034978 A JP 14034978A JP S5567999 A JPS5567999 A JP S5567999A
Authority
JP
Japan
Prior art keywords
fault
block
data
processor
memory
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
JP14034978A
Other languages
Japanese (ja)
Inventor
Toshiyuki Furui
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 JP14034978A priority Critical patent/JPS5567999A/en
Publication of JPS5567999A publication Critical patent/JPS5567999A/en
Pending legal-status Critical Current

Links

Landscapes

  • Techniques For Improving Reliability Of Storages (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)

Abstract

PURPOSE: To prevent a decrease in activity rate due to the occurrence of a fault by simple constitution by displaying the fault occurring to an in-use memory block and then by transferring and storing fault information in a stand-by block.
CONSTITUTION: Data are written in fixed blocks M00, M01... of memory 1 by processor 8 through data lines 101W104 and address lines 120 and 121 respectively and processor 8 makes a decision on the existence of a fault through output data lines 105W108 at every time of access. Once a fault occurs to block M22 of memory 1, a corresponding position on fault block registration table 3 is inverted from "0" to "1" through processor 8 to display the fault and fault data is written in stand-by block 5 selected by OR circuit 6 and AND circuit 7 through control logic line 124 and input selector circuit 4. This data is transferred again to block M22, etc., at the same time as the fault recovery of block M22, etc. Read operation is similarly performed and a decrease in activity rate at the time of the occurrence of the fault is prevented by simple constitution.
COPYRIGHT: (C)1980,JPO&Japio
JP14034978A 1978-11-14 1978-11-14 Memory unit Pending JPS5567999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14034978A JPS5567999A (en) 1978-11-14 1978-11-14 Memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14034978A JPS5567999A (en) 1978-11-14 1978-11-14 Memory unit

Publications (1)

Publication Number Publication Date
JPS5567999A true JPS5567999A (en) 1980-05-22

Family

ID=15266755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14034978A Pending JPS5567999A (en) 1978-11-14 1978-11-14 Memory unit

Country Status (1)

Country Link
JP (1) JPS5567999A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5868296A (en) * 1981-10-16 1983-04-23 Nec Corp Storage device
JPS593800A (en) * 1982-06-16 1984-01-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Memory system
JPS593799A (en) * 1982-06-16 1984-01-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Memory system able to rearrange defects during operation
JPS6478346A (en) * 1987-09-19 1989-03-23 Fujitsu Ltd Alternate memory control system
JPH02146648A (en) * 1988-11-29 1990-06-05 Nec Corp Memory card

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5868296A (en) * 1981-10-16 1983-04-23 Nec Corp Storage device
JPS593800A (en) * 1982-06-16 1984-01-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Memory system
JPS593799A (en) * 1982-06-16 1984-01-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Memory system able to rearrange defects during operation
JPS6478346A (en) * 1987-09-19 1989-03-23 Fujitsu Ltd Alternate memory control system
JPH02146648A (en) * 1988-11-29 1990-06-05 Nec Corp Memory card

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