JPS5512531A - Memory unit - Google Patents

Memory unit

Info

Publication number
JPS5512531A
JPS5512531A JP8387678A JP8387678A JPS5512531A JP S5512531 A JPS5512531 A JP S5512531A JP 8387678 A JP8387678 A JP 8387678A JP 8387678 A JP8387678 A JP 8387678A JP S5512531 A JPS5512531 A JP S5512531A
Authority
JP
Japan
Prior art keywords
address
rom
data
memory unit
sum check
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
JP8387678A
Other languages
Japanese (ja)
Inventor
Makoto Kishi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8387678A priority Critical patent/JPS5512531A/en
Publication of JPS5512531A publication Critical patent/JPS5512531A/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

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

Abstract

PURPOSE:To enable to replace only the ROM element for corresponding data at data change, by providing the sum check code to only the data in the ROM element in ROM elements. CONSTITUTION:The sum check code is respectively fed to the data at 0 to 1K-2 address in 1K-1 address of ROM's 1 and 5, to the data at 1K to 2K-2 address in 2K-1 address of ROM's 2 and 6, and to the data at 2K-3K-2 in 3K-1 address of ROM's 3 and 7, and further, to the data at 3K-4K-2 address in 4K-1 address of ROM's 4 and 8. Further, at sum check, binary sum of each bit at 0 to 4K-1 address is made and chicking is made by verifying the agreement of the value to the predetermined value.
JP8387678A 1978-07-10 1978-07-10 Memory unit Pending JPS5512531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8387678A JPS5512531A (en) 1978-07-10 1978-07-10 Memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8387678A JPS5512531A (en) 1978-07-10 1978-07-10 Memory unit

Publications (1)

Publication Number Publication Date
JPS5512531A true JPS5512531A (en) 1980-01-29

Family

ID=13814850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8387678A Pending JPS5512531A (en) 1978-07-10 1978-07-10 Memory unit

Country Status (1)

Country Link
JP (1) JPS5512531A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6455660A (en) * 1987-08-26 1989-03-02 Sanyo Electric Co Memory circuit
JP2009238420A (en) * 2008-03-26 2009-10-15 Tokai Rika Co Ltd Lever switch device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4964345A (en) * 1972-10-20 1974-06-21
JPS52112243A (en) * 1976-03-17 1977-09-20 Nippon Signal Co Ltd:The Error detection system for exclusive reading memory

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4964345A (en) * 1972-10-20 1974-06-21
JPS52112243A (en) * 1976-03-17 1977-09-20 Nippon Signal Co Ltd:The Error detection system for exclusive reading memory

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6455660A (en) * 1987-08-26 1989-03-02 Sanyo Electric Co Memory circuit
JP2009238420A (en) * 2008-03-26 2009-10-15 Tokai Rika Co Ltd Lever switch device

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