JPS6462740A - Reading/writing circuit for memory card - Google Patents
Reading/writing circuit for memory cardInfo
- Publication number
- JPS6462740A JPS6462740A JP21958687A JP21958687A JPS6462740A JP S6462740 A JPS6462740 A JP S6462740A JP 21958687 A JP21958687 A JP 21958687A JP 21958687 A JP21958687 A JP 21958687A JP S6462740 A JPS6462740 A JP S6462740A
- Authority
- JP
- Japan
- Prior art keywords
- memory card
- memory
- circuit
- readable
- address range
- 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
Links
Abstract
PURPOSE:To prevent the breakdown of the memory contents of a memory card, by providing a switching means for switching the outputs of plural pieces of logic circuits in accordance with a readable/writable address range of the memory card to be used. CONSTITUTION:A device selecting signal switching circuit 40 and a set signal generating circuit 60 are provided. That is, the titled circuit is constituted by having a device selecting signal switching circuit 44 by which a device selecting signal CS goes to active '0' only in a readable/writable address range of an installed memory card 1, especially, OR gates 46-1-46-5 and three-state buffers 47-1-47-5. In such a way, in a reading-out/writing circuit in which the memory cards 1 of several kinds of memory capacities can be used, it is prevented that the memory content of the memory card 1 is broken down erroneously by a write operation which has exceeded the readable/writable address range of the installed memory card 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21958687A JPS6462740A (en) | 1987-09-02 | 1987-09-02 | Reading/writing circuit for memory card |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21958687A JPS6462740A (en) | 1987-09-02 | 1987-09-02 | Reading/writing circuit for memory card |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6462740A true JPS6462740A (en) | 1989-03-09 |
Family
ID=16737853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21958687A Pending JPS6462740A (en) | 1987-09-02 | 1987-09-02 | Reading/writing circuit for memory card |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6462740A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6058540B2 (en) * | 1978-05-26 | 1985-12-20 | コンパニ−・アンテルナシヨナル・プ−ル・ランフオルマテイク・セ−イイ・ハニ−ウエル・ブル | Method for testing a reference zone of a data carrier and apparatus for carrying out the method |
JPS6270957A (en) * | 1985-09-24 | 1987-04-01 | Hitachi Ltd | Automatic discriminating method for memory capacity |
JPS62180585A (en) * | 1986-02-04 | 1987-08-07 | Tokyo Electric Co Ltd | Chip selecting circuit |
-
1987
- 1987-09-02 JP JP21958687A patent/JPS6462740A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6058540B2 (en) * | 1978-05-26 | 1985-12-20 | コンパニ−・アンテルナシヨナル・プ−ル・ランフオルマテイク・セ−イイ・ハニ−ウエル・ブル | Method for testing a reference zone of a data carrier and apparatus for carrying out the method |
JPS6270957A (en) * | 1985-09-24 | 1987-04-01 | Hitachi Ltd | Automatic discriminating method for memory capacity |
JPS62180585A (en) * | 1986-02-04 | 1987-08-07 | Tokyo Electric Co Ltd | Chip selecting circuit |
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