Apparatus for controlling a displayed image on a raster scan display
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United States of America Patent
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Jun 20, 1995
Issued Date -
N/A
app pub date -
Dec 20, 1993
filing date -
Sep 6, 1988
priority date (Note) -
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Abstract
An apparatus for controlling an image display device such as the CRT includes a dual port memory having a first memory and a second memory. Data may be written into a first memory and read from the first memory at any time. Data is sequentially read from the second memory to provide information for the display. Data is manipulated during a data transfer cycle, a dynamic memory refresh cycle, a memory write cycle and a memory read cycle. Data is transmitted between the first memory and second memory during a data transfer cycle. A cycle reconciliation circuit prioritizes the manner in which the cycles occur giving top priority to the data transfer cycle.
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