JPS5792498A - Error detecting circuit of read-only memory system - Google Patents

Error detecting circuit of read-only memory system

Info

Publication number
JPS5792498A
JPS5792498A JP16724680A JP16724680A JPS5792498A JP S5792498 A JPS5792498 A JP S5792498A JP 16724680 A JP16724680 A JP 16724680A JP 16724680 A JP16724680 A JP 16724680A JP S5792498 A JPS5792498 A JP S5792498A
Authority
JP
Japan
Prior art keywords
data
cpu1
parity
read
rom2a
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
JP16724680A
Other languages
Japanese (ja)
Inventor
Mikio Otani
Hideo Ichikawa
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.)
Shinko Electric Co Ltd
Original Assignee
Shinko 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 Shinko Electric Co Ltd filed Critical Shinko Electric Co Ltd
Priority to JP16724680A priority Critical patent/JPS5792498A/en
Publication of JPS5792498A publication Critical patent/JPS5792498A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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

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)
  • Debugging And Monitoring (AREA)
  • Read Only Memory (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)

Abstract

PURPOSE:To check the fault of an ROM securely by storing data for a parity check in an RAM and by performing error detection by generating and comparing a parity bit with the stored data at any time. CONSTITUTION:After parity checking data is stored in an RAM2b, a CPU1 starts operating and data are read, address by address, out of an ROM2a; and the parity checking data are generated successively by a parity bit generating circuit 4 on the basis of the readout data of the ROM2a, and the generated data are compared with data, read out of the RAM2b by a strobe signal, by a parity error detecting circuit 5. If the both are different from each other, the circuit 5 sends an interruption signal to the CPU1. Consequently, the operation of the CPU1 stops automatically. Then, the data of the ROM2a is corrected and the CPU1 is put in operation again. When no difference is found, the operation of the CPU1 continues without interruption.
JP16724680A 1980-11-26 1980-11-26 Error detecting circuit of read-only memory system Pending JPS5792498A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16724680A JPS5792498A (en) 1980-11-26 1980-11-26 Error detecting circuit of read-only memory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16724680A JPS5792498A (en) 1980-11-26 1980-11-26 Error detecting circuit of read-only memory system

Publications (1)

Publication Number Publication Date
JPS5792498A true JPS5792498A (en) 1982-06-09

Family

ID=15846161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16724680A Pending JPS5792498A (en) 1980-11-26 1980-11-26 Error detecting circuit of read-only memory system

Country Status (1)

Country Link
JP (1) JPS5792498A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59174642U (en) * 1983-05-10 1984-11-21 三菱電機株式会社 Memory abnormality detection circuit
JPS628282A (en) * 1985-07-04 1987-01-16 Toppan Moore Co Ltd Ic card with error detecting function
US5513192A (en) * 1992-08-28 1996-04-30 Sun Microsystems, Inc. Fault tolerant disk drive system with error detection and correction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59174642U (en) * 1983-05-10 1984-11-21 三菱電機株式会社 Memory abnormality detection circuit
JPS628282A (en) * 1985-07-04 1987-01-16 Toppan Moore Co Ltd Ic card with error detecting function
US5513192A (en) * 1992-08-28 1996-04-30 Sun Microsystems, Inc. Fault tolerant disk drive system with error detection and correction

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