JPS55944A - Clock switching system - Google Patents
Clock switching systemInfo
- Publication number
- JPS55944A JPS55944A JP7396578A JP7396578A JPS55944A JP S55944 A JPS55944 A JP S55944A JP 7396578 A JP7396578 A JP 7396578A JP 7396578 A JP7396578 A JP 7396578A JP S55944 A JPS55944 A JP S55944A
- Authority
- JP
- Japan
- Prior art keywords
- clock
- circuit
- clock switching
- computers
- same time
- 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 eliminate on the operation of a system with two computers even at the time of clock switching, by providing clock generating devices, clock assignment devices and clock switching circuits corresponding to computers.
CONSTITUTION: This clock switching system consists of clock generating devices 19A and 19B which correspond to computer systems A and B, service processors 13A and 13B which assign a device to be used, switching circuits 14A and 14B, and interface signal line 18. To switch device 19A to 19B while processors 13A and 13B are indicating device 19B, circuit 14A halts device 19A and also informs circuit 14B of that. Circuit 14B stops the operation from device 19A and starts the operation from device 19B, informing device 19A of that. Then circuits 14A and 14B stop clocks from device 19A at the same time and send out clocks from device 19B at the same time, thereby securing the operation of the system even in a swtiching mode.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53073965A JPS5919373B2 (en) | 1978-06-19 | 1978-06-19 | Clock switching method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53073965A JPS5919373B2 (en) | 1978-06-19 | 1978-06-19 | Clock switching method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55944A true JPS55944A (en) | 1980-01-07 |
JPS5919373B2 JPS5919373B2 (en) | 1984-05-04 |
Family
ID=13533289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53073965A Expired JPS5919373B2 (en) | 1978-06-19 | 1978-06-19 | Clock switching method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5919373B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105016A (en) * | 1980-12-22 | 1982-06-30 | Nec Corp | Clock source switching system |
JPS57127366A (en) * | 1981-01-30 | 1982-08-07 | Sanyo Electric Co Ltd | Horizontal afc circuit of television picture receiver |
JPS57201848U (en) * | 1981-06-17 | 1982-12-22 | ||
JPS6095623A (en) * | 1983-10-31 | 1985-05-29 | Hitachi Ltd | Information processing system |
JP2010205154A (en) * | 2009-03-05 | 2010-09-16 | Fujitsu Ltd | Clock supply method and information processing apparatus |
-
1978
- 1978-06-19 JP JP53073965A patent/JPS5919373B2/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105016A (en) * | 1980-12-22 | 1982-06-30 | Nec Corp | Clock source switching system |
JPS6250034B2 (en) * | 1980-12-22 | 1987-10-22 | Nippon Denki Kk | |
JPS57127366A (en) * | 1981-01-30 | 1982-08-07 | Sanyo Electric Co Ltd | Horizontal afc circuit of television picture receiver |
JPS6126873B2 (en) * | 1981-01-30 | 1986-06-23 | Sanyo Electric Co | |
JPS57201848U (en) * | 1981-06-17 | 1982-12-22 | ||
JPS6228781Y2 (en) * | 1981-06-17 | 1987-07-23 | ||
JPS6095623A (en) * | 1983-10-31 | 1985-05-29 | Hitachi Ltd | Information processing system |
JP2010205154A (en) * | 2009-03-05 | 2010-09-16 | Fujitsu Ltd | Clock supply method and information processing apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS5919373B2 (en) | 1984-05-04 |
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