JPS57179996A - Semiconductor storage device - Google Patents

Semiconductor storage device

Info

Publication number
JPS57179996A
JPS57179996A JP56062424A JP6242481A JPS57179996A JP S57179996 A JPS57179996 A JP S57179996A JP 56062424 A JP56062424 A JP 56062424A JP 6242481 A JP6242481 A JP 6242481A JP S57179996 A JPS57179996 A JP S57179996A
Authority
JP
Japan
Prior art keywords
bit
memory cell
information
spare
decoder
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
JP56062424A
Other languages
Japanese (ja)
Other versions
JPS6135639B2 (en
Inventor
Junichi Inoue
Junzo Yamada
Tsuneo Mano
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56062424A priority Critical patent/JPS57179996A/en
Publication of JPS57179996A publication Critical patent/JPS57179996A/en
Publication of JPS6135639B2 publication Critical patent/JPS6135639B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To constitute memories strong against the deterioration of memory cells, by providing a circuit having a spare decoder and a spare memory cell, and provide a circuit for replacing a defective memory cell with the spare memory cell.
CONSTITUTION: When an error correction signal ϕc is inputted to a memory, (1) is written in a register R1 corresponding to a row decoder selecting a memory cell reading out the error data. After a prescribed time (t1) is elapsed, an information in the R1 is written in the 1st bit S11 of a shift register SR1, an information in the S11 is shifted to a bit S12, an information of the S12 is to a bit S13, and an information of a bit S13 is shifted to a bit S14 respectively. When the content of shift registers are all at (1), if a readout data from a memory cell selected from a row decoder when one or more errors take place in a time (t1), contunues for a time 4(t1), the decoder is replaced into a spare decoder.
COPYRIGHT: (C)1982,JPO&Japio
JP56062424A 1981-04-27 1981-04-27 Semiconductor storage device Granted JPS57179996A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56062424A JPS57179996A (en) 1981-04-27 1981-04-27 Semiconductor storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56062424A JPS57179996A (en) 1981-04-27 1981-04-27 Semiconductor storage device

Publications (2)

Publication Number Publication Date
JPS57179996A true JPS57179996A (en) 1982-11-05
JPS6135639B2 JPS6135639B2 (en) 1986-08-14

Family

ID=13199753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56062424A Granted JPS57179996A (en) 1981-04-27 1981-04-27 Semiconductor storage device

Country Status (1)

Country Link
JP (1) JPS57179996A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61217993A (en) * 1985-03-22 1986-09-27 Mitsubishi Electric Corp Semiconductor memory

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5279736A (en) * 1975-12-26 1977-07-05 Hitachi Ltd Memory error detecting control system
JPS5384634A (en) * 1976-12-30 1978-07-26 Fujitsu Ltd Ic memory unit device
JPS56100A (en) * 1979-06-15 1981-01-06 Fujitsu Ltd Semiconductor memory device
JPS5622290A (en) * 1979-07-27 1981-03-02 Fujitsu Ltd Failure controlling system for memory unit
JPS5622293A (en) * 1979-07-30 1981-03-02 Fujitsu Ltd Control system for replacement memory

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5279736A (en) * 1975-12-26 1977-07-05 Hitachi Ltd Memory error detecting control system
JPS5384634A (en) * 1976-12-30 1978-07-26 Fujitsu Ltd Ic memory unit device
JPS56100A (en) * 1979-06-15 1981-01-06 Fujitsu Ltd Semiconductor memory device
JPS5622290A (en) * 1979-07-27 1981-03-02 Fujitsu Ltd Failure controlling system for memory unit
JPS5622293A (en) * 1979-07-30 1981-03-02 Fujitsu Ltd Control system for replacement memory

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61217993A (en) * 1985-03-22 1986-09-27 Mitsubishi Electric Corp Semiconductor memory

Also Published As

Publication number Publication date
JPS6135639B2 (en) 1986-08-14

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