JPS5545221A - Clock break detection circuit - Google Patents
Clock break detection circuitInfo
- Publication number
- JPS5545221A JPS5545221A JP11805478A JP11805478A JPS5545221A JP S5545221 A JPS5545221 A JP S5545221A JP 11805478 A JP11805478 A JP 11805478A JP 11805478 A JP11805478 A JP 11805478A JP S5545221 A JPS5545221 A JP S5545221A
- Authority
- JP
- Japan
- Prior art keywords
- clocks
- gate
- clock
- frame
- output
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
PURPOSE:To reduce a cost and a space by constituting a low-speed clock break detection circuit with only digital elements by utlizing points where high-speed reference clocks and low-speed frame clocks are sent from a master clock unit. CONSTITUTION:The existence of coming of frame clocks are stored in shift registers 72 and 73 by anti-phase clocks of the reference input, which pass through gate 71, while shifting them successively. The output is inputted to exclusive OR gate 74, so that the output of reference input 2-clock components gate 74 becomes high- level after the frame clock comes. At this time, counter 78 is reset and does not reach 1023; however, when even one of frame clocks lacks, counter 75 reaches 1023, and a pulse appears at the 1023 output of decoder 76 to set a flip flop through OR gate 79, and alarm is indicated to software similarly to reference clock break.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11805478A JPS5545221A (en) | 1978-09-27 | 1978-09-27 | Clock break detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11805478A JPS5545221A (en) | 1978-09-27 | 1978-09-27 | Clock break detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5545221A true JPS5545221A (en) | 1980-03-29 |
| JPS5755346B2 JPS5755346B2 (en) | 1982-11-24 |
Family
ID=14726870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11805478A Granted JPS5545221A (en) | 1978-09-27 | 1978-09-27 | Clock break detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5545221A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5988738U (en) * | 1982-11-30 | 1984-06-15 | ソニー株式会社 | Microcomputer clock signal generation circuit |
| WO1994010801A1 (en) * | 1992-11-05 | 1994-05-11 | Ampex Systems Corporation | Input clock presence detector for a digital video input signal |
| CN107229009A (en) * | 2016-03-25 | 2017-10-03 | 精工爱普生株式会社 | Circuit arrangement, measuring physical, electronic equipment and moving body |
-
1978
- 1978-09-27 JP JP11805478A patent/JPS5545221A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5988738U (en) * | 1982-11-30 | 1984-06-15 | ソニー株式会社 | Microcomputer clock signal generation circuit |
| WO1994010801A1 (en) * | 1992-11-05 | 1994-05-11 | Ampex Systems Corporation | Input clock presence detector for a digital video input signal |
| CN107229009A (en) * | 2016-03-25 | 2017-10-03 | 精工爱普生株式会社 | Circuit arrangement, measuring physical, electronic equipment and moving body |
| CN107229009B (en) * | 2016-03-25 | 2021-02-12 | 精工爱普生株式会社 | Circuit device, physical quantity detection device, electronic apparatus, and moving object |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5755346B2 (en) | 1982-11-24 |
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