Method and apparatus for loosely sychronizing closed free-running raster displays
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United States of America Patent
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Aug 4, 1998
Issued Date -
N/A
app pub date -
Sep 12, 1996
filing date -
Nov 4, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a means and method for synchronizing closed free-running systems, such as graphics systems, with no external synchronization signals required. Video games and most computer display controllers are closed free-running systems. Because most such systems have the means to switch between an interlaced and non-interlaced operation, and because interlaced and non-interlaced modes have a relative timing variation, the timing between two or more such closed free-running systems can be synchronized. This method allows synchronization with an imprecise timing reference. The vertical display timing is the free-running oscillator and the interlaced/non-interlaced mode transition is used as the timing adjustment means. The actual arrival time of data in a communication medium connecting two systems being synchronized is used in relation to an expected arrival time to provide the clock reference.
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