JPS5513439A - Protecting system for input/output device - Google Patents
Protecting system for input/output deviceInfo
- Publication number
- JPS5513439A JPS5513439A JP8509978A JP8509978A JPS5513439A JP S5513439 A JPS5513439 A JP S5513439A JP 8509978 A JP8509978 A JP 8509978A JP 8509978 A JP8509978 A JP 8509978A JP S5513439 A JPS5513439 A JP S5513439A
- Authority
- JP
- Japan
- Prior art keywords
- input
- output device
- register
- key
- protecting system
- 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
Abstract
PURPOSE: To realize both the reading and writing protection for the input/output device with every access bus as well as to decrease the amount of materials for the system.
CONSTITUTION: Identification register 11 is set with 0 or 1 by wake-up given from the channel device to memorize the wake-up system. Command register 12 memorizes the command at that time, and input/output device address register 14 memorizes the address of the input/output device. Selector 19 selects either one of reading protection key 15 and 17 which are shown by register 11 and 14 each. At the same time, selector 20 selects either one of writing protection key 16 and 18 shown by register 11 and 14 each. Key 15 or 17 thus selected is supplied to AND gate 21, and key 16 or 18 selected is supplied to AND gate 22 respectively. The selection can be performed also with the output of decoder 13.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53085099A JPS6054692B2 (en) | 1978-07-14 | 1978-07-14 | I/O device protection method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53085099A JPS6054692B2 (en) | 1978-07-14 | 1978-07-14 | I/O device protection method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5513439A true JPS5513439A (en) | 1980-01-30 |
JPS6054692B2 JPS6054692B2 (en) | 1985-12-02 |
Family
ID=13849155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53085099A Expired JPS6054692B2 (en) | 1978-07-14 | 1978-07-14 | I/O device protection method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6054692B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62122196A (en) * | 1985-11-21 | 1987-06-03 | 日立コンデンサ株式会社 | Manufacture of multilayer wiring board |
-
1978
- 1978-07-14 JP JP53085099A patent/JPS6054692B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62122196A (en) * | 1985-11-21 | 1987-06-03 | 日立コンデンサ株式会社 | Manufacture of multilayer wiring board |
Also Published As
Publication number | Publication date |
---|---|
JPS6054692B2 (en) | 1985-12-02 |
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