Dual-mode graphics controller with preemptive video access
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United States of America Patent
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May 12, 1998
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N/A
app pub date -
Sep 10, 1993
filing date -
Sep 10, 1993
priority date (Note) -
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Abstract
A method and architecture for a graphics controller chip. The graphics controller has a display memory for storing video and graphics data. It also has a logic controller, connected to the memory, for performing logic operations on data stored in the memory. Video and graphics data is made available to the graphics controller at a single access port. The graphics controller also has an address range detector for checking the address of the data provided to the port and for disabling logical operations of the logic controller when the address indicates the presence of video data. The video data is thereafter transferred to the display memory on a priority basis.
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