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MB86R02 'Jade-D' Hardware Manual V1.64
18.6.2.4
Display position control
The graphic image data to be displayed is located in the logical 2D coordinates space (logical graphics
space) in the Graphics Memory. There are six logical graphics spaces as follows:
L0 layer, L1 layer, L2 layer, L3 layer , L4 layer, L5 layer
The relation between the logical graphics space and display position is defined as follows:
Origin Address (OA)
OA
Origin Address
W
Stride
H
Height
DA
Display Address
DX
Display Position
DY
Display Address (DA)
Display Position X,Y (DX,DY)
Stride (W)
VDP
HDP
Display Position Parameters
Origin address of logical graphics space. Memory address of top left
edge pixel in logical frame origin
Width of logical graphics space. Defined in 64-byte unit
Height of logical graphics space. Total raster (pixel) count of field
Display origin address. Top left position address of display frame origin
Display origin coordinates.
Coordinates in logical frame space of display frame origin
Logical Frame
Display Frame
18-21
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