MB86290A Datasheet, PDF (38/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

4 Graphics Memory
4.1 Configuration
MB86290A uses local external memory (Graphics Memory) for drawing and
display management. The configuration of this Graphics Memory is
described as follows:
4.1.1 Data Type
MB86290A handles the following types of data. Display list can be stored
in the host (main) memory as well. Texture-tiling pattern and text pattern
can be defined by a display list as well.
Drawing frame
This is a rectangular image data field for 2D/3D drawing. Two or more
drawing frames can be used at once. The frame size can be bigger than the
display frame size and display part of it. The drawing frame can be applied
in 32-pixel units (both horizontally and vertically), and the maximum size is
4096 × 4096. Both direct and indirect color modes can be used.
Display frame
This is a rectangular image data field for display. Up to four layers (three
of graphics and one of video/graphics) can be overlaid and displayed at once.
From bottom to the top, these are called the B (Base), M (Middle), W
(Window), and C (Console) layers.
Z buffer
The Z buffer eliminates hidden surfaces in 3D drawing. The configuration is
the same as drawing frame (defined for 3D drawing). 2 bytes/pixel of
memory resources must be assigned. The Z buffer must be cleared prior to
3D drawing.
Polygon draw flag buffer
This is a work field for random shape drawing of multiple vertices. 1
bit/pixel should be defined for the drawing shape. This flag buffer must be
cleared prior to drawing.
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