JPS59114654A - Memory device - Google Patents

Memory device

Info

Publication number
JPS59114654A
JPS59114654A JP57223790A JP22379082A JPS59114654A JP S59114654 A JPS59114654 A JP S59114654A JP 57223790 A JP57223790 A JP 57223790A JP 22379082 A JP22379082 A JP 22379082A JP S59114654 A JPS59114654 A JP S59114654A
Authority
JP
Japan
Prior art keywords
memory area
partial writing
specific memory
areas
address
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
JP57223790A
Other languages
Japanese (ja)
Inventor
Hirotoshi Inao
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 JP57223790A priority Critical patent/JPS59114654A/en
Publication of JPS59114654A publication Critical patent/JPS59114654A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units

Abstract

PURPOSE:To reduce as less as possible the overheads due to the error checking and to improve the cost performance by changing the partial writing or reading method in response to the memory areas. CONSTITUTION:When a partial writing request is delivered to a momory 2 from a processor 1, an address deciding circuit 8 decides whether the designated address is within a specific memory area and then turns on a signal line 23 if the address is within the specific memory area. In a partial writing mode to the specific memory area, an error correcting circuit 14 produces and delivers an error correction code. A main control part 9 decides as a partial writing request to the areas excluding the specific memory area if the line 23 is not turned on. Thus the partial writing data added with bits only is delivered from the circuit 14. The partial writing is carried out to the areas excepting the specific memory area without taking reading operation of data.
JP57223790A 1982-12-22 1982-12-22 Memory device Pending JPS59114654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57223790A JPS59114654A (en) 1982-12-22 1982-12-22 Memory device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57223790A JPS59114654A (en) 1982-12-22 1982-12-22 Memory device

Publications (1)

Publication Number Publication Date
JPS59114654A true JPS59114654A (en) 1984-07-02

Family

ID=16803747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57223790A Pending JPS59114654A (en) 1982-12-22 1982-12-22 Memory device

Country Status (1)

Country Link
JP (1) JPS59114654A (en)

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