JPS5672725A - Bus control system - Google Patents
Bus control systemInfo
- Publication number
- JPS5672725A JPS5672725A JP15029879A JP15029879A JPS5672725A JP S5672725 A JPS5672725 A JP S5672725A JP 15029879 A JP15029879 A JP 15029879A JP 15029879 A JP15029879 A JP 15029879A JP S5672725 A JPS5672725 A JP S5672725A
- Authority
- JP
- Japan
- Prior art keywords
- bus
- permission
- state mode
- signals
- line
- 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
- Logic Circuits (AREA)
- Small-Scale Networks (AREA)
Abstract
PURPOSE: To make it possible to realize a bus control circuit of high reliability by giving the permission to use a bus after making sure that the bus line is in three- state mode securely.
CONSTITUTION: Requests to use a bus, when arriving from bus request signal lines 1-1...1-n, are latched in latch circuits 3-1...3-n as far as the three-state mode of bus line 2 is detected by three-state detecting circuit 9 and permission signals are outputted to bus-use permission signals 5-1...5-n. The bus permission signals and bus request signals are AND-ed by ANDs 6-1...6-n, and according to their outputs, one of data from data signal lines 8-1...8-n is sent out to bus line 2. As the bus using device finishes the use of the bus, bus 2 is placed in three-state mode. Thus, the high-reliability bus control circuit can be realized by giving the permission to use the next bus after making sure that the bus line is in three-state mode securely.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15029879A JPS5672725A (en) | 1979-11-20 | 1979-11-20 | Bus control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15029879A JPS5672725A (en) | 1979-11-20 | 1979-11-20 | Bus control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5672725A true JPS5672725A (en) | 1981-06-17 |
Family
ID=15493938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15029879A Pending JPS5672725A (en) | 1979-11-20 | 1979-11-20 | Bus control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5672725A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814228A (en) * | 1981-07-18 | 1983-01-27 | Nippon Telegr & Teleph Corp <Ntt> | Information processor |
JPS58115514A (en) * | 1981-12-29 | 1983-07-09 | Hitachi Ltd | Connection detecting system |
JPH07281918A (en) * | 1994-04-13 | 1995-10-27 | Nec Corp | Switching circuit for duplex signal relay system |
-
1979
- 1979-11-20 JP JP15029879A patent/JPS5672725A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814228A (en) * | 1981-07-18 | 1983-01-27 | Nippon Telegr & Teleph Corp <Ntt> | Information processor |
JPS58115514A (en) * | 1981-12-29 | 1983-07-09 | Hitachi Ltd | Connection detecting system |
JPH07281918A (en) * | 1994-04-13 | 1995-10-27 | Nec Corp | Switching circuit for duplex signal relay system |
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