JPS5637893A - Address change-over unit of programmable read-only memory - Google Patents

Address change-over unit of programmable read-only memory

Info

Publication number
JPS5637893A
JPS5637893A JP11031579A JP11031579A JPS5637893A JP S5637893 A JPS5637893 A JP S5637893A JP 11031579 A JP11031579 A JP 11031579A JP 11031579 A JP11031579 A JP 11031579A JP S5637893 A JPS5637893 A JP S5637893A
Authority
JP
Japan
Prior art keywords
prom
control data
addresses
area
write
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
JP11031579A
Other languages
Japanese (ja)
Inventor
Ginzo Yamazaki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11031579A priority Critical patent/JPS5637893A/en
Publication of JPS5637893A publication Critical patent/JPS5637893A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make it possible to write data in a normal area by making an area, where an error is happening, unused by selectively changing over addresses of PROM running into trouble.
CONSTITUTION: When the information volume of control data to be written never surpasses 512B, switch SW is turned on to set the most significant digit bit A0 to "0". Then, nine bits of memory addresses A1WA9 are selectively activated to write control data in PROM by way of data input-output terminals b0Wb7. As a result, the control data are written at addresses 0W511 in area I. In case that there is a fault found in PROM, SW is turned off to set the most significant digit bit A0 of the address to "1" and nine bits A1WA9 are selectively activated to write the control data at addresses 512W1023 in area II of PROM via input-output terminals b0Wb7.
COPYRIGHT: (C)1981,JPO&Japio
JP11031579A 1979-08-31 1979-08-31 Address change-over unit of programmable read-only memory Pending JPS5637893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11031579A JPS5637893A (en) 1979-08-31 1979-08-31 Address change-over unit of programmable read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11031579A JPS5637893A (en) 1979-08-31 1979-08-31 Address change-over unit of programmable read-only memory

Publications (1)

Publication Number Publication Date
JPS5637893A true JPS5637893A (en) 1981-04-11

Family

ID=14532592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11031579A Pending JPS5637893A (en) 1979-08-31 1979-08-31 Address change-over unit of programmable read-only memory

Country Status (1)

Country Link
JP (1) JPS5637893A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58152226A (en) * 1982-03-05 1983-09-09 Minolta Camera Co Ltd Data outputting device of camera accessory
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
JPH0333927A (en) * 1989-06-29 1991-02-14 Canon Inc Electronic equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58152226A (en) * 1982-03-05 1983-09-09 Minolta Camera Co Ltd Data outputting device of camera accessory
JPH0456293B2 (en) * 1982-03-05 1992-09-08 Minolta Camera Kk
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
JPH0333927A (en) * 1989-06-29 1991-02-14 Canon Inc Electronic equipment

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