JPS578998A - Switching control system for substitution memory - Google Patents

Switching control system for substitution memory

Info

Publication number
JPS578998A
JPS578998A JP8238080A JP8238080A JPS578998A JP S578998 A JPS578998 A JP S578998A JP 8238080 A JP8238080 A JP 8238080A JP 8238080 A JP8238080 A JP 8238080A JP S578998 A JPS578998 A JP S578998A
Authority
JP
Japan
Prior art keywords
error
memory
access
normal
access request
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
JP8238080A
Other languages
Japanese (ja)
Other versions
JPS648863B2 (en
Inventor
Moriyuki Takamura
Shohei Ikehara
Tokuji Furuto
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
Original Assignee
Fujitsu 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 filed Critical Fujitsu Ltd
Priority to JP8238080A priority Critical patent/JPS578998A/en
Publication of JPS578998A publication Critical patent/JPS578998A/en
Publication of JPS648863B2 publication Critical patent/JPS648863B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
    • G11C29/70—Masking faults in memories by using spares or by reconfiguring

Landscapes

  • Techniques For Improving Reliability Of Storages (AREA)
  • Debugging And Monitoring (AREA)

Abstract

PURPOSE:To elminate all errors of a storage device by using a substitute memory only data read out of a storage by access requested by a cyclic access generating circuit has an error. CONSTITUTION:Once an error correcting circuit 38 recognizes an error in data read out of a normal 33 by an access request 10p generated by a cyclic access generating circut 100, the memory 33 is switched to a substitute memory 34. Even if there is an error in readout data by a normal access request source, the error correcting circuit 38 only detects the occurrence of the error and corrects it and never controls the switching to the substitute memory. Therefore, the switching to the shifting memory is performed, regardless of access from the access request source, in reponse to the error in the normal memory, so that the errors in the storage device is eliminate completely.
JP8238080A 1980-06-18 1980-06-18 Switching control system for substitution memory Granted JPS578998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8238080A JPS578998A (en) 1980-06-18 1980-06-18 Switching control system for substitution memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8238080A JPS578998A (en) 1980-06-18 1980-06-18 Switching control system for substitution memory

Publications (2)

Publication Number Publication Date
JPS578998A true JPS578998A (en) 1982-01-18
JPS648863B2 JPS648863B2 (en) 1989-02-15

Family

ID=13772967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8238080A Granted JPS578998A (en) 1980-06-18 1980-06-18 Switching control system for substitution memory

Country Status (1)

Country Link
JP (1) JPS578998A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517857A (en) * 1978-07-25 1980-02-07 Hitachi Ltd Ic memory trouble switching system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517857A (en) * 1978-07-25 1980-02-07 Hitachi Ltd Ic memory trouble switching system

Also Published As

Publication number Publication date
JPS648863B2 (en) 1989-02-15

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