MB86290A Datasheet, PDF (45/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

5.2 Display Function
5.2.1 Layer Configuration
MB86290A supports four layers of display frames (C, W, M and B).
Furthermore, the M and B layers can be split into two separate windows at
any position (L frame and R frame). All these six frames are assigned as
logically separated fields in the Graphics Memory.
C-layer (Console layer)
Top frame for console display
8, 16 bits/pixel
W-layer (Window layer)
16 bits/pixel
M-layer (Middle layer)
Additional overlay data
8,16 bits/pixel split into two partitions
B-layer (Base layer)
Navigation map data
8,16 bits/pixel split into two partitions
Configuration of Display Layers
When the resolution exceeding the VGA (640 x 480) is required, the layer count or pixel
data which can be simultaneously displayed is restricted according to the capability of
frame memory for supplying data.
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