JPS5679322A - Bus selection system - Google Patents
Bus selection systemInfo
- Publication number
- JPS5679322A JPS5679322A JP15615979A JP15615979A JPS5679322A JP S5679322 A JPS5679322 A JP S5679322A JP 15615979 A JP15615979 A JP 15615979A JP 15615979 A JP15615979 A JP 15615979A JP S5679322 A JPS5679322 A JP S5679322A
- Authority
- JP
- Japan
- Prior art keywords
- processor
- request
- input
- processors
- detects
- 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)
- Multi Processors (AREA)
Abstract
PURPOSE: To offer respective processor services equally by facilitating the contention among processors by looking in the detection of whether a request exists, by attaining access to the processor indicated by the value of a sequential counter under microprogram control.
CONSTITUTION: To input-output device 20, #0 processor 10 and #1 processor 11 are connected and service requests from processors 10 and 11 are inputted to request detecting circuit 21 via start request signal lines 31 and 32. The transmission and reception of data to and from device 20 are performed via input-output bus lines 33 and 34 connected to bus circuit 22. In addition, sequential counter 23 selecting processor 10 or 11 is made by microcontrol part 24 to count up and request detecting circuit 21 detects a start request, on the basis of the value of counter 23, by the processor number and according to whether the start request signal exists. The signal that this request detecting circut 21 detects is supplied to input-output device 26 via control part 24 to accept the start of bus circuit 22.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15615979A JPS5679322A (en) | 1979-11-30 | 1979-11-30 | Bus selection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15615979A JPS5679322A (en) | 1979-11-30 | 1979-11-30 | Bus selection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5679322A true JPS5679322A (en) | 1981-06-29 |
Family
ID=15621631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15615979A Pending JPS5679322A (en) | 1979-11-30 | 1979-11-30 | Bus selection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5679322A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04140876A (en) * | 1990-10-02 | 1992-05-14 | Nec Corp | Data processing system |
-
1979
- 1979-11-30 JP JP15615979A patent/JPS5679322A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04140876A (en) * | 1990-10-02 | 1992-05-14 | Nec Corp | Data processing system |
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