Method and apparatus for constructing a frame buffer with a fast

Details Method and apparatus for constructing a frame buffer with a fast Method and apparatus for constructing a frame buffer with a fast

1996-03-22

1999-09-28

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Computer graphic processing system

Integrated circuit

345113, 345473, 345509, G09G 500

Patent

active

059596384

ABSTRACT:
A method and apparatus for quickly copying a first frame region into a second frame region. A video memory array comprising a plurality of video random access memory devices is divided into at least two frame regions. A background image is rendered by a central processing unit into a background frame region within the video memory array. The central processing unit then requests the background image in the background frame region to be copied into a new frame region in the video memory array. A dedicated circuit copies the entire background image in the background frame region into the new frame region. The dedicated circuit operates by using a serial data register within each video random access memory device during the vertical retrace period of a video timing signal. The dedicated circuit performs the background frame copy without requiring any processing resources from the central processing unit.

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