JPS60123045U - Read/write protection device - Google Patents
Read/write protection deviceInfo
- Publication number
- JPS60123045U JPS60123045U JP1984005260U JP526084U JPS60123045U JP S60123045 U JPS60123045 U JP S60123045U JP 1984005260 U JP1984005260 U JP 1984005260U JP 526084 U JP526084 U JP 526084U JP S60123045 U JPS60123045 U JP S60123045U
- Authority
- JP
- Japan
- Prior art keywords
- protection device
- read
- write protection
- rom
- storage device
- 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
Landscapes
- Storage Device Security (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図はマイクロプロセッサのライトアクセス時のタイ
ミングチャート、第２図は本考案によるメモーリプロテ
クション方式の一実施例の説明図である。
１・・・・・・タイミングクロック、２・・・・・・メ
モリアドレス、９・・・・・・マイクロプロセッサ、１
０・・・・・・ＲＯＭ、ｌ ｌ・・・・・・ゲート回路
、１２・・・・・・プロテクト解除スイッチ、１３・・
・・・・タイムアウト監視回路、１７・・・・・・イン
バータ回路。FIG. 1 is a timing chart during write access of a microprocessor, and FIG. 2 is an explanatory diagram of an embodiment of the memory protection method according to the present invention. 1...Timing clock, 2...Memory address, 9...Microprocessor, 1
0...ROM, l l...gate circuit, 12...protection release switch, 13...
...Timeout monitoring circuit, 17...Inverter circuit.
Claims (1)
ス信号を、あらかじめ設定されたＲＯＭ又はＲＡＭのア
ドレスへ共に出力し、選択されたＲＯＭ又はＲＡＭのア
ドレスに対する出力データの内容によって記憶装置のリ
ード又はライトプロテクション装置において、 前記マイクロプロセッサ−から出力される前記記憶装置
への前記アドレス信号を、直ちに前記ＲＯＭ又は前記Ｒ
ＡＭのアドレス信号に用いることを特徴とするり−ド／
ライトプロテクション装置。[Claims for Utility Model Registration] Address signals to a storage device connected to a microprocessor are output together to a preset ROM or RAM address, and the content of output data for the selected ROM or RAM address In a read or write protection device for a storage device, the address signal output from the microprocessor to the storage device is immediately transferred to the ROM or the R
A reader/reader characterized in that it is used for an AM address signal.
Light protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984005260U JPS60123045U (en) | 1984-01-20 | 1984-01-20 | Read/write protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984005260U JPS60123045U (en) | 1984-01-20 | 1984-01-20 | Read/write protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60123045U true JPS60123045U (en) | 1985-08-19 |
Family
ID=30481600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984005260U Pending JPS60123045U (en) | 1984-01-20 | 1984-01-20 | Read/write protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60123045U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6222165A (en) * | 1985-07-23 | 1987-01-30 | Fujitsu Ltd | Control system for access to main storage device |
-
1984
- 1984-01-20 JP JP1984005260U patent/JPS60123045U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6222165A (en) * | 1985-07-23 | 1987-01-30 | Fujitsu Ltd | Control system for access to main storage device |
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