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Required synchronization of video and color information is provided through latching for delaying color signals.
English (United States)
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Output Latching of Color and Video Signals for a Color Monitor Adapter
Required synchronization of video and color information is provided through
latching for delaying color signals.
Due to the high speed of a color adapter (a dot time on the order of 45 nsec),
all dots are on for the entire dot time. Due to this short period, it is impossible to
process video information through the logic paths required for blanking, reverse
video, and other functions, and still maintain synchronization of the video
information with the color data stored in a first set of data latches 1 included in an
To maintain synchronization, additional latches 2 and 3 are provided to delay
the color signal for precisely as long as the video signal takes to be processed.
The color delay and the video processing is done in dot time increments.
The video signal is processed in several stages, each designed to be
completed in less than one dot time. At the end of each stage, the signal is
latched for the beginning of the next function.
Following completion of video processing, the signal passes through a final
latch 4 and appears at color logic 5 simultaneously with a arrival of the
corresponding color signals. These signals, upon being gated through logic 5,
may also be latched or sent directly to the monitor if the maximum delay is a
small fraction of the dot time.
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