JPS5641578A - Block selector of memory unit - Google Patents

Block selector of memory unit

Info

Publication number
JPS5641578A
JPS5641578A JP11455779A JP11455779A JPS5641578A JP S5641578 A JPS5641578 A JP S5641578A JP 11455779 A JP11455779 A JP 11455779A JP 11455779 A JP11455779 A JP 11455779A JP S5641578 A JPS5641578 A JP S5641578A
Authority
JP
Japan
Prior art keywords
lines
block
memory
address
unit
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
JP11455779A
Other languages
Japanese (ja)
Inventor
Norikazu Fujii
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11455779A priority Critical patent/JPS5641578A/en
Publication of JPS5641578A publication Critical patent/JPS5641578A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C8/00—Arrangements for selecting an address in a digital store
    • G11C8/12—Group selection circuits, e.g. for memory block selection, chip selection, array selection

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)

Abstract

PURPOSE:To simplify a block selecting circuit while preventing malfunction by using a few address lines from the lowest-order and highest-order ones as memory- unit selection lines and block selection lines. CONSTITUTION:For addition by block selection switches in each memory unit, S2 is a one-bit adder, S3 is a two-bit adder and S4-S7 are three-bit adders. Blocks B1-B8 are selected by comparing circuits C1-C8. The number of address lines A is three and when those three lines are all held at ''0'', the selection state is set. As for four memory units, although memory blocks B1-B8 may be selected in parallel, only one unit is enabled by selecting circuits composed of SW1-SW7, S2-S7 and C2-C8 to operation and in or from one address information is written or read. The high-order three lines are used as block selection lines, the need for an address setting switch is eliminated and setting errors are also eliminated, so that the block selecting circuit can be simplified.
JP11455779A 1979-09-06 1979-09-06 Block selector of memory unit Pending JPS5641578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11455779A JPS5641578A (en) 1979-09-06 1979-09-06 Block selector of memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11455779A JPS5641578A (en) 1979-09-06 1979-09-06 Block selector of memory unit

Publications (1)

Publication Number Publication Date
JPS5641578A true JPS5641578A (en) 1981-04-18

Family

ID=14640779

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11455779A Pending JPS5641578A (en) 1979-09-06 1979-09-06 Block selector of memory unit

Country Status (1)

Country Link
JP (1) JPS5641578A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388707A (en) * 1980-06-30 1983-06-14 Hitachi, Ltd. Memory selecting system
JPS5973448A (en) * 1982-10-18 1984-04-25 Kiyoshi Hajikano Optical fiber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388707A (en) * 1980-06-30 1983-06-14 Hitachi, Ltd. Memory selecting system
JPS5973448A (en) * 1982-10-18 1984-04-25 Kiyoshi Hajikano Optical fiber

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