JPS57111739A - Read-only memory correction system - Google Patents

Read-only memory correction system

Info

Publication number
JPS57111739A
JPS57111739A JP18708880A JP18708880A JPS57111739A JP S57111739 A JPS57111739 A JP S57111739A JP 18708880 A JP18708880 A JP 18708880A JP 18708880 A JP18708880 A JP 18708880A JP S57111739 A JPS57111739 A JP S57111739A
Authority
JP
Japan
Prior art keywords
address
rom
step group
written
sub
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
JP18708880A
Other languages
Japanese (ja)
Inventor
Yasuo Satake
Hajime Ito
Hideki Jikuya
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 JP18708880A priority Critical patent/JPS57111739A/en
Publication of JPS57111739A publication Critical patent/JPS57111739A/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
    • G11C29/76—Masking faults in memories by using spares or by reconfiguring using address translation or modifications

Landscapes

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

Abstract

PURPOSE:To correct an ROM economically and quickly, by writing a corrected step group in an idle area of the ROM, and writing a corresponding address of the corrected step group in an address table, when correcting a step group of the ROM. CONSTITUTION:A main program of an ROM is split, and to areas AP1-AP3, step groups P1-P3 are written, respectively. Corresponding to each step, presteps PP1-PP3 having a discrimination number, and an instruction for jumping to a subroutine SUB are written in areas ADP1-ADP3. A return address from the SUB is stored in an RAM. When it has been detected that the step group P2 requires a correction, a corrected step group P2-C is written in an idle area AP2-C of the ROM, an address of AP2-C is written on an area corresponding to the step group P2 of an address table ADT, and it is jumped to this address by the SUB. Accordingly, the CPU accesses the head address of AP2-C, and executes the program by a correct step group.
JP18708880A 1980-12-29 1980-12-29 Read-only memory correction system Pending JPS57111739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18708880A JPS57111739A (en) 1980-12-29 1980-12-29 Read-only memory correction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18708880A JPS57111739A (en) 1980-12-29 1980-12-29 Read-only memory correction system

Publications (1)

Publication Number Publication Date
JPS57111739A true JPS57111739A (en) 1982-07-12

Family

ID=16199897

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18708880A Pending JPS57111739A (en) 1980-12-29 1980-12-29 Read-only memory correction system

Country Status (1)

Country Link
JP (1) JPS57111739A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318441A (en) * 1986-07-09 1988-01-26 Natl Space Dev Agency Japan<Nasda> On-board computer for space-flying body
JPS6318440A (en) * 1986-07-09 1988-01-26 Natl Space Dev Agency Japan<Nasda> On-board computer for space-flying body
JPH02211529A (en) * 1989-02-13 1990-08-22 Hitachi Ltd Data processor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318441A (en) * 1986-07-09 1988-01-26 Natl Space Dev Agency Japan<Nasda> On-board computer for space-flying body
JPS6318440A (en) * 1986-07-09 1988-01-26 Natl Space Dev Agency Japan<Nasda> On-board computer for space-flying body
JPH02211529A (en) * 1989-02-13 1990-08-22 Hitachi Ltd Data processor

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