JPS6457498A - Partial correcting circuit for mask rom reading data - Google Patents

Partial correcting circuit for mask rom reading data

Info

Publication number
JPS6457498A
JPS6457498A JP21560887A JP21560887A JPS6457498A JP S6457498 A JPS6457498 A JP S6457498A JP 21560887 A JP21560887 A JP 21560887A JP 21560887 A JP21560887 A JP 21560887A JP S6457498 A JPS6457498 A JP S6457498A
Authority
JP
Japan
Prior art keywords
mask rom
correcting
data
address
reading
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
JP21560887A
Other languages
Japanese (ja)
Other versions
JPH0770237B2 (en
Inventor
Sukeyuki Tofuku
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
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 filed Critical NEC Corp
Priority to JP21560887A priority Critical patent/JPH0770237B2/en
Publication of JPS6457498A publication Critical patent/JPS6457498A/en
Publication of JPH0770237B2 publication Critical patent/JPH0770237B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Read Only Memory (AREA)
  • Stored Programmes (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)

Abstract

PURPOSE:To use a microprocessor unit and a mask ROM in an integrated circuit consisting of one chip by providing a switching circuit for outputting correcting data only when a reading address coincides with a correcting address. CONSTITUTION:The mask ROM 11 in which error data to be corrected is included and recorded, an address register 13 for holding a recording position in which the error data is recorded as the correcting address and a data register 14 for holding the correcting data for correcting the error data are provided. Further, a coincidence circuit 15 for generating a coincidence signal when the reading address for reading the mask ROM coincides with the correcting address and the switching circuit 17 for outputting the correcting data in place of reading data read from the mask ROM only when the coincidence signal is generated are provided. Thereby, respective circuits can be formed by incorporating all the microprocessor units and the mask ROM in the integrated circuit consisting of one chip.
JP21560887A 1987-08-28 1987-08-28 Partial correction circuit for mask ROM read data Expired - Lifetime JPH0770237B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21560887A JPH0770237B2 (en) 1987-08-28 1987-08-28 Partial correction circuit for mask ROM read data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21560887A JPH0770237B2 (en) 1987-08-28 1987-08-28 Partial correction circuit for mask ROM read data

Publications (2)

Publication Number Publication Date
JPS6457498A true JPS6457498A (en) 1989-03-03
JPH0770237B2 JPH0770237B2 (en) 1995-07-31

Family

ID=16675243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21560887A Expired - Lifetime JPH0770237B2 (en) 1987-08-28 1987-08-28 Partial correction circuit for mask ROM read data

Country Status (1)

Country Link
JP (1) JPH0770237B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03252997A (en) * 1990-03-02 1991-11-12 Hitachi Ltd Semiconductor memory device
US6954889B2 (en) 2000-06-12 2005-10-11 Matsushita Electric Industrial Co., Ltd. Circuit for modifying stored data

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945694A (en) * 1982-09-06 1984-03-14 Fujitsu Ltd Modification system for rom read information

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945694A (en) * 1982-09-06 1984-03-14 Fujitsu Ltd Modification system for rom read information

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03252997A (en) * 1990-03-02 1991-11-12 Hitachi Ltd Semiconductor memory device
US6954889B2 (en) 2000-06-12 2005-10-11 Matsushita Electric Industrial Co., Ltd. Circuit for modifying stored data

Also Published As

Publication number Publication date
JPH0770237B2 (en) 1995-07-31

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