JPS551607A - Read data correction system of mask read-only memory - Google Patents

Read data correction system of mask read-only memory

Info

Publication number
JPS551607A
JPS551607A JP7222078A JP7222078A JPS551607A JP S551607 A JPS551607 A JP S551607A JP 7222078 A JP7222078 A JP 7222078A JP 7222078 A JP7222078 A JP 7222078A JP S551607 A JPS551607 A JP S551607A
Authority
JP
Japan
Prior art keywords
program
mask
read
rom
read data
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
JP7222078A
Other languages
Japanese (ja)
Inventor
Yasumi Takahashi
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 JP7222078A priority Critical patent/JPS551607A/en
Publication of JPS551607A publication Critical patent/JPS551607A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/08—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements

Landscapes

  • Static Random-Access Memory (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Read Only Memory (AREA)

Abstract

PURPOSE:To correct simply read data of a mask program ROM by combining program logic arrays and encode program ROMs. CONSTITUTION:Program logic arrays 11-1... inhibit the read of mask program ROM 1 through OR circuit 13 according to input address signals and generate the second address signal to address corresponding encode program ROM 12-1..., and correction data dependent upon ROM 12-1... is generated. Consequently, read data of the mask program ROM where specifications are changed can be corrected in a simple constitution, where many wirings, etc., are needless, by combining writable program logic arrays and encode program ROMs.
JP7222078A 1978-06-16 1978-06-16 Read data correction system of mask read-only memory Pending JPS551607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7222078A JPS551607A (en) 1978-06-16 1978-06-16 Read data correction system of mask read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7222078A JPS551607A (en) 1978-06-16 1978-06-16 Read data correction system of mask read-only memory

Publications (1)

Publication Number Publication Date
JPS551607A true JPS551607A (en) 1980-01-08

Family

ID=13482938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7222078A Pending JPS551607A (en) 1978-06-16 1978-06-16 Read data correction system of mask read-only memory

Country Status (1)

Country Link
JP (1) JPS551607A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207949A (en) * 1981-06-17 1982-12-20 Tokyo Electric Co Ltd Memory controller
JPS595497A (en) * 1982-07-02 1984-01-12 Hitachi Ltd Semiconductor rom
JPS5985545A (en) * 1982-11-09 1984-05-17 Fujitsu Ltd Correcting and processing system for contents of system rom
JPS59135600U (en) * 1983-02-25 1984-09-10 株式会社アドバンテスト Electronic equipment with rewritable non-volatile memory
JPS59185099A (en) * 1984-02-28 1984-10-20 Toshiba Corp Nonvolatile semiconductor memory
JPS61230699A (en) * 1985-04-05 1986-10-14 Nippon Denki Kanji Syst Kk Storage system
JPS6234399A (en) * 1985-08-07 1987-02-14 Sony Corp Memory element and its using method
JPH0296699U (en) * 1989-01-20 1990-08-01

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207949A (en) * 1981-06-17 1982-12-20 Tokyo Electric Co Ltd Memory controller
JPS595497A (en) * 1982-07-02 1984-01-12 Hitachi Ltd Semiconductor rom
JPS5985545A (en) * 1982-11-09 1984-05-17 Fujitsu Ltd Correcting and processing system for contents of system rom
JPS59135600U (en) * 1983-02-25 1984-09-10 株式会社アドバンテスト Electronic equipment with rewritable non-volatile memory
JPS59185099A (en) * 1984-02-28 1984-10-20 Toshiba Corp Nonvolatile semiconductor memory
JPS61230699A (en) * 1985-04-05 1986-10-14 Nippon Denki Kanji Syst Kk Storage system
JPS6234399A (en) * 1985-08-07 1987-02-14 Sony Corp Memory element and its using method
JPH0296699U (en) * 1989-01-20 1990-08-01

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