JPS54125939A - Bus line control method - Google Patents
Bus line control methodInfo
- Publication number
- JPS54125939A JPS54125939A JP3311878A JP3311878A JPS54125939A JP S54125939 A JPS54125939 A JP S54125939A JP 3311878 A JP3311878 A JP 3311878A JP 3311878 A JP3311878 A JP 3311878A JP S54125939 A JPS54125939 A JP S54125939A
- Authority
- JP
- Japan
- Prior art keywords
- bus
- cpu1
- reset signal
- collective
- retrieving
- 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
- Bus Control (AREA)
- Small-Scale Networks (AREA)
Abstract
PURPOSE: To ensure an effective control for the bus line when the collective reset is given, by retrieving all I/OS' occupied by the processor and then transmitting the collective reset signals to the retrieved I/O in sequence.
CONSTITUTION: In case CPU1-1 occupies the using right of I/O5-1 on shared I/O bus 7 and carries out the control, the collective reset signal is transmitted from CPU1-1 by some reason to discontinue all processes under execution and to secure the original state. In such case, the resetting is possible easily to I/O2-1 within the self-system. For I/O5-1 on bus 7, however, bus coupler 4-2 which caught the reset signal from CPU1-1 takes the acquisition sequence for the bus using right of bus 7 to obtain the bus using right, and then CPU1-1 gives a sequential retrieving to I/O5-1 which is under occupation. After this, CPU1-1 reads out I/O recognition information DUA under occupation to decode it, and then the reset signal line exclusive for the retrieved shared I/O is driven.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3311878A JPS54125939A (en) | 1978-03-24 | 1978-03-24 | Bus line control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3311878A JPS54125939A (en) | 1978-03-24 | 1978-03-24 | Bus line control method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54125939A true JPS54125939A (en) | 1979-09-29 |
Family
ID=12377708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3311878A Pending JPS54125939A (en) | 1978-03-24 | 1978-03-24 | Bus line control method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54125939A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6263326A (en) * | 1985-09-12 | 1987-03-20 | Nec Corp | Emergency controlling system |
-
1978
- 1978-03-24 JP JP3311878A patent/JPS54125939A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6263326A (en) * | 1985-09-12 | 1987-03-20 | Nec Corp | Emergency controlling system |
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