JPH04170655A - Duplex memory unit - Google Patents

Duplex memory unit

Info

Publication number
JPH04170655A
JPH04170655A JP2299622A JP29962290A JPH04170655A JP H04170655 A JPH04170655 A JP H04170655A JP 2299622 A JP2299622 A JP 2299622A JP 29962290 A JP29962290 A JP 29962290A JP H04170655 A JPH04170655 A JP H04170655A
Authority
JP
Japan
Prior art keywords
memory
memory unit
parity checker
selector
cpu
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
JP2299622A
Other languages
Japanese (ja)
Other versions
JP2993099B2 (en
Inventor
So Akai
Yoshiji Morioka
Tadayuki Yamada
Eiji Kato
Isao Domoto
Original Assignee
Yokogawa Electric 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 Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP2299622A priority Critical patent/JP2993099B2/en
Publication of JPH04170655A publication Critical patent/JPH04170655A/en
Application granted granted Critical
Publication of JP2993099B2 publication Critical patent/JP2993099B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To improve the reliability of a memory part by providing this duplex memory unit with a selector for selecting an output from the 2nd memory part when an output from a parity checker indicates an error.
CONSTITUTION: The 1st and 2nd memory parts 1, 2 store the same write data and the same parity bit impressed from a CPU 100 through respective buffer gates 13, 14 in the same address. Only when an error is detected from the parity checker 3 at the time of reading out data from a CPU 100, the selector 4 selects and outputs data read out from the 2nd memory part 2, and when the parity checker 3 indicates a normal state, selects and outputs data from the 1st memory part 1. Consequently, the reliability of the memory part can sharply be improved.
COPYRIGHT: (C)1992,JPO&Japio
JP2299622A 1990-11-05 1990-11-05 Redundant memory device Expired - Fee Related JP2993099B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2299622A JP2993099B2 (en) 1990-11-05 1990-11-05 Redundant memory device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2299622A JP2993099B2 (en) 1990-11-05 1990-11-05 Redundant memory device

Publications (2)

Publication Number Publication Date
JPH04170655A true JPH04170655A (en) 1992-06-18
JP2993099B2 JP2993099B2 (en) 1999-12-20

Family

ID=17874993

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2299622A Expired - Fee Related JP2993099B2 (en) 1990-11-05 1990-11-05 Redundant memory device

Country Status (1)

Country Link
JP (1) JP2993099B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012169114A1 (en) * 2011-06-10 2012-12-13 日本電気株式会社 Semiconductor storage device, control method for same, and non-transitory computer readable medium in which control program is stored

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012169114A1 (en) * 2011-06-10 2012-12-13 日本電気株式会社 Semiconductor storage device, control method for same, and non-transitory computer readable medium in which control program is stored

Also Published As

Publication number Publication date
JP2993099B2 (en) 1999-12-20

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