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MB86R02 'Jade-D' Hardware Manual V1.64
18.6.2 Display Function
18.6.2.1
Layer configuration
Six-layer window display is possible. Layer overlay sequence can be set in any order. A four-layer
display mode and left/right split display mode are also provided, supporting reverse compatibility with
previous GDCs.
L0 (
)
L4 (
L0WX,L0WY
L5 (
)
L5WX,L5WY
L3 (
(a) Six layer window display
The correspondence between the display layers for this GDC and for previous GDcs is shown below.
Layer
correspondence
L0
C
(L0WX, L0WY)
L1
W
(L1WX, L1WY)
L2
ML
(L2WX, L2WY)
L3
MR
(L3WX, L3WY)
L4
BL
(L4WX, L4WY)
L5
BR
(L5WX, L5WY)
C, W, ML, MR, BL and BR above refer to layers of previous products. Window mode or compatibility
mode can be selected for each layer. It is possible to use new functions via minor program changes by
allowing the coexistence of display modes instead of separating them completely.
However, if high resolutions are displayed, the simultaneously-displayed layer count and pixel data
may be restricted according to the graphics memory's ability to supply data.
)
L2 (
L4WX,L4WY
L2WX,L2WY
L1 (
L1WX,L1WY
background color
)
L3WX,L3WY
Configuration of Display Layers
Coordinates of starting point
Compatibility
Window mode
mode
(0, 0)
(WX, WY)
(0, 0)
(HDB, 0)
(0, 0)
(HDB, 0)
)
L0,L2,L4 (
)
0,0
)
(b) Four layer display for reverse compatibility
Window mode
(L0WW, L0WH + 1)
(L1WW, L1WH + 1)
(L2WW, L2WH + 1)
(L3WW, L3WH + 1)
(L4WW, L4WH + 1)
(L5WW, L5WH + 1)
L1 (
)
L3,L5 (
WX,WY
HDB+1
Width/height
Compatibility mode
(HDP + 1, VDP + 1)
(WW, WH + 1)
(HDB + 1, VDP + 1)
(HDP − HDB, VDP + 1)
(HDB + 1, VDP + 1)
(HDP − HDB, VDP + 1)
,
)
0
18-17
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