JPS5774898A - Main storage device - Google Patents

Main storage device

Info

Publication number
JPS5774898A
JPS5774898A JP55151755A JP15175580A JPS5774898A JP S5774898 A JPS5774898 A JP S5774898A JP 55151755 A JP55151755 A JP 55151755A JP 15175580 A JP15175580 A JP 15175580A JP S5774898 A JPS5774898 A JP S5774898A
Authority
JP
Japan
Prior art keywords
mode
write
storage device
main storage
blocks
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
JP55151755A
Other languages
Japanese (ja)
Inventor
Isao Kimura
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 JP55151755A priority Critical patent/JPS5774898A/en
Publication of JPS5774898A publication Critical patent/JPS5774898A/en
Pending 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
    • G11C29/74—Masking faults in memories by using spares or by reconfiguring using duplex memories, i.e. using dual copies
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1076—Parity data used in redundant arrays of independent storages, e.g. in RAID systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE:To increase the reliability of a main storage device and to prevent the reduction in capacity at a normal mode, by dividing a memory bank into 2 sets of the same memory blocks and performing simultaneous readout and write-in at a double write mode. CONSTITUTION:A memory bank is divided into two sets of the same memory blocks 9, 10 connected to check bit generating circuits 7, 8, error correction check circuits 13, 14 and correction circuits 15, 16. At a double write-in mode, simultaneous readout and write-in for the blocks 9, 10 are made and when an error is detected at the circuit 13 or 14, the readout data from the block 10 or 9 in which no error is detected with a readout data selection controlling circuit 17, is selected. On the other hand, at a normal mode, the blocks 9, 10 are used in series, and the reliability of the main storage device can be increased by the double mode and the reduction in the capacity at a normal mode can be avoided.
JP55151755A 1980-10-28 1980-10-28 Main storage device Pending JPS5774898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55151755A JPS5774898A (en) 1980-10-28 1980-10-28 Main storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151755A JPS5774898A (en) 1980-10-28 1980-10-28 Main storage device

Publications (1)

Publication Number Publication Date
JPS5774898A true JPS5774898A (en) 1982-05-11

Family

ID=15525579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151755A Pending JPS5774898A (en) 1980-10-28 1980-10-28 Main storage device

Country Status (1)

Country Link
JP (1) JPS5774898A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6155747U (en) * 1984-09-14 1986-04-15
EP0323123A2 (en) * 1987-12-24 1989-07-05 Fujitsu Limited A storage control system in a computer system
JPH032943A (en) * 1989-02-24 1991-01-09 Data General Corp Storage system
WO2013069136A1 (en) 2011-11-10 2013-05-16 富士通株式会社 Information processing device, information processing method, information processing program, and recording medium in which program is recorded

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6155747U (en) * 1984-09-14 1986-04-15
JPH0313795Y2 (en) * 1984-09-14 1991-03-28
EP0323123A2 (en) * 1987-12-24 1989-07-05 Fujitsu Limited A storage control system in a computer system
JPH032943A (en) * 1989-02-24 1991-01-09 Data General Corp Storage system
WO2013069136A1 (en) 2011-11-10 2013-05-16 富士通株式会社 Information processing device, information processing method, information processing program, and recording medium in which program is recorded
US9552241B2 (en) 2011-11-10 2017-01-24 Fujitsu Limited Information processing apparatus, method of information processing, and recording medium having stored therein program for information processing

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