Synchronization of CRT controller chips
US4495594A · kind A · utility
19Cited by
9References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1981 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Jul 1, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two controller units controlling a single input/output device such as a cathode ray tube (CRT) are synchronized by a command signal. Upon appearance of the command signal, the slave controller unit, which may have been running unsynchronized with the master controller, is stopped at the time for vertical retrace and remains stopped until vertical retrace time for the master controller. At this point, the slave controller is restarted in synchronism with the master controller and remains synchronized so long as both master and slave receive the same clock and the same screen refresh parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.