JPS5467728A - Selection error detector - Google Patents
Selection error detectorInfo
- Publication number
- JPS5467728A JPS5467728A JP13427277A JP13427277A JPS5467728A JP S5467728 A JPS5467728 A JP S5467728A JP 13427277 A JP13427277 A JP 13427277A JP 13427277 A JP13427277 A JP 13427277A JP S5467728 A JPS5467728 A JP S5467728A
- Authority
- JP
- Japan
- Prior art keywords
- selection
- potential
- devices
- numbers
- controllers
- 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
Abstract
PURPOSE: To simplify the connection between I/O controllers by communicating the selection state of I/O devices to I/O controllers through a single signal line.
CONSTITUTION: When selection numbers for I/O devices 30, 40 and 50 are given to selection number comparator circuits 31, 41 and 51 from selection number transmitting circuit 11, these selection numbers are compared with numbers peculiar to devices; and in case of coincidence, for example, switch 33 is closed to connect resistance 34 to reference potential VL. If the potential of reference power source 12 is denoted as VH, VO=(VH-VL)R1/R1+R2 is true in respect to potential VO of selection confirmation line 27. If another I/O device is selected simultaneously potential VOD of selection confirmation line 27 is set to make VOD <VS<VO (VS is the input of voltage comparator 14 due to voltage divider 13) true. By this comparison, simultaneouus selection is detected. The connection mode becomes simple because the selection state can be transmitted by a single signal line.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13427277A JPS5467728A (en) | 1977-11-09 | 1977-11-09 | Selection error detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13427277A JPS5467728A (en) | 1977-11-09 | 1977-11-09 | Selection error detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5467728A true JPS5467728A (en) | 1979-05-31 |
Family
ID=15124399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13427277A Pending JPS5467728A (en) | 1977-11-09 | 1977-11-09 | Selection error detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5467728A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS564824A (en) * | 1979-06-25 | 1981-01-19 | Meidensha Electric Mfg Co Ltd | Detector of multiple selection in computer system |
JPS564823A (en) * | 1979-06-25 | 1981-01-19 | Meidensha Electric Mfg Co Ltd | Detector of multiple selection in computer system |
JPS60224199A (en) * | 1984-04-20 | 1985-11-08 | Fujitsu Ltd | Semiconductor storage device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5328346A (en) * | 1976-08-27 | 1978-03-16 | Takeda Riken Ind Co Ltd | Address setting error detector |
-
1977
- 1977-11-09 JP JP13427277A patent/JPS5467728A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5328346A (en) * | 1976-08-27 | 1978-03-16 | Takeda Riken Ind Co Ltd | Address setting error detector |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS564824A (en) * | 1979-06-25 | 1981-01-19 | Meidensha Electric Mfg Co Ltd | Detector of multiple selection in computer system |
JPS564823A (en) * | 1979-06-25 | 1981-01-19 | Meidensha Electric Mfg Co Ltd | Detector of multiple selection in computer system |
JPS5816487B2 (en) * | 1979-06-25 | 1983-03-31 | 株式会社明電舎 | Multiple selection detection device in computer system |
JPS60224199A (en) * | 1984-04-20 | 1985-11-08 | Fujitsu Ltd | Semiconductor storage device |
JPH0263280B2 (en) * | 1984-04-20 | 1990-12-27 | Fujitsu Ltd |
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