JPS55101178A - Memory unit - Google Patents
Memory unitInfo
- Publication number
- JPS55101178A JPS55101178A JP797879A JP797879A JPS55101178A JP S55101178 A JPS55101178 A JP S55101178A JP 797879 A JP797879 A JP 797879A JP 797879 A JP797879 A JP 797879A JP S55101178 A JPS55101178 A JP S55101178A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- cards
- selection
- address
- circuit
- 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
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 make it possible that an upper-level unit performs required memory selection in the order of memory address bits according to capacities by switching arrangement of address signals according to memory capacity discrimination signals of memory cards. CONSTITUTION:Memory capacity discrimination signal SEL becomes high-level or low-level dependently upon capacity 64K bytes or 256 bytes of memory cards 37-40 which form memory module 26 of memory unit 2, and switching of AND gates 6, 8, 10 and 12 and AND gates 7, 9, 11 and 13 of selection circuit 5 of address circuit 4 is controlled through NAND circuit 3, etc. Therefore, the address signal from CPU1 is switched by circuit 5, decoder circuit 35, etc., according to memory capacities of cards 37-40, so that CPU1 can perform address selection in cards 37-40, selection of a memory element line, selection of cards 37-40, etc., continuously in the order of bits of memory address data according to memory capacities.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP797879A JPS55101178A (en) | 1979-01-25 | 1979-01-25 | Memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP797879A JPS55101178A (en) | 1979-01-25 | 1979-01-25 | Memory unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55101178A true JPS55101178A (en) | 1980-08-01 |
JPS623505B2 JPS623505B2 (en) | 1987-01-26 |
Family
ID=11680531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP797879A Granted JPS55101178A (en) | 1979-01-25 | 1979-01-25 | Memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55101178A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59186058A (en) * | 1983-03-31 | 1984-10-22 | ハネウエル・インフォメーション・システムズ・インコーポレーテッド | Apparatus and method for identifying memory |
JPS62168248A (en) * | 1986-01-20 | 1987-07-24 | Nec Corp | Memory device |
JPH0651948U (en) * | 1992-12-21 | 1994-07-15 | 住友ベークライト株式会社 | Printed wiring board |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5372533A (en) * | 1976-12-10 | 1978-06-28 | Sharp Corp | Block selecting device for memory card |
JPS5372534A (en) * | 1976-12-10 | 1978-06-28 | Sharp Corp | Block selection system for memory card |
-
1979
- 1979-01-25 JP JP797879A patent/JPS55101178A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5372533A (en) * | 1976-12-10 | 1978-06-28 | Sharp Corp | Block selecting device for memory card |
JPS5372534A (en) * | 1976-12-10 | 1978-06-28 | Sharp Corp | Block selection system for memory card |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59186058A (en) * | 1983-03-31 | 1984-10-22 | ハネウエル・インフォメーション・システムズ・インコーポレーテッド | Apparatus and method for identifying memory |
JPH0517582B2 (en) * | 1983-03-31 | 1993-03-09 | Haneiueru Infuoomeishon Shisutemusu Inc | |
JPS62168248A (en) * | 1986-01-20 | 1987-07-24 | Nec Corp | Memory device |
JPH0651948U (en) * | 1992-12-21 | 1994-07-15 | 住友ベークライト株式会社 | Printed wiring board |
Also Published As
Publication number | Publication date |
---|---|
JPS623505B2 (en) | 1987-01-26 |
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