JPS56134377A - Storage device - Google Patents

Storage device

Info

Publication number
JPS56134377A
JPS56134377A JP3646880A JP3646880A JPS56134377A JP S56134377 A JPS56134377 A JP S56134377A JP 3646880 A JP3646880 A JP 3646880A JP 3646880 A JP3646880 A JP 3646880A JP S56134377 A JPS56134377 A JP S56134377A
Authority
JP
Japan
Prior art keywords
address
line
contents
rom
logic
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
JP3646880A
Other languages
Japanese (ja)
Inventor
Koichi Bando
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
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3646880A priority Critical patent/JPS56134377A/en
Publication of JPS56134377A publication Critical patent/JPS56134377A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/06—Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication
    • G06F12/0615—Address space extension
    • G06F12/0623—Address space extension for memory modules

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Read Only Memory (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE:To expand the use range of ROM by reading the contents of ROM and RAM simultaneously by using the same address and by writing data in only RAM. CONSTITUTION:Decoders 11 and 21 are connected to common address assignment line 5. To read one word in assigned address A, the binary number that corresponds to address A is applied to line 5 and a pulse of logic ''1'' is applied to readable line 6 to store the contents of address A of ROM12 by using the 1st-(B0)-th bits of read register 3 and those of address A of ROM22 by using the (B0+1)-th bit-(Ba)-th bit respectively. To rewrite the contents of address A of RAM22, data is set in write register 4, the binary number that corresponds to address A is applied to line 5, and a pulse of logic ''1'' is also applied to writable line 7.
JP3646880A 1980-03-21 1980-03-21 Storage device Pending JPS56134377A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3646880A JPS56134377A (en) 1980-03-21 1980-03-21 Storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3646880A JPS56134377A (en) 1980-03-21 1980-03-21 Storage device

Publications (1)

Publication Number Publication Date
JPS56134377A true JPS56134377A (en) 1981-10-21

Family

ID=12470638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3646880A Pending JPS56134377A (en) 1980-03-21 1980-03-21 Storage device

Country Status (1)

Country Link
JP (1) JPS56134377A (en)

Similar Documents

Publication Publication Date Title
KR840000838A (en) Multi-Ward Memory Data Storage and Addressing Techniques and Devices
JPS56134390A (en) Rom element
GB1260914A (en) Memory with redundancy
EP0043416A3 (en) Storage addressing control apparatus
JPS56134377A (en) Storage device
GB1074739A (en) Content addressable memory
GB1188290A (en) Improvements in or relating to Information Retrieval Systems
JPS55134442A (en) Data transfer unit
JPS5715271A (en) Memory device
JPS5616980A (en) Write-in system of one-bit of memory
JPS52102013A (en) Memory unit
JPS5443630A (en) Memory access control system
EP0272670A3 (en) Segment descriptor unit
ES458285A1 (en) Data processing system having portions of data addressing and instruction addressing information provided by a common source
JPS5588154A (en) Data storage method
JPS5710853A (en) Memory device
JPS57135490A (en) Storage device
JPS57130144A (en) Image data rotating circuit
JPS56163594A (en) Memory control device
CH550458A (en) MEMORY CELL FOR STORING A BIT AND USING SUCH MEMORY CELLS IN A DATA MEMORY.
JPS55153196A (en) Semiconductor memory
JPS6432348A (en) Memory access system
JPS6459581A (en) Data writing device for ic card
JPS56105546A (en) Memory mapping circuit
Hayes Treatise on analytical chemistry. Part 2, analytical chemistry of the elements, volume 1 (Kolthoff, IM; Elving, Philip J.)