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MB86R02 'Jade-D' Hardware Manual V1.64
MDR1/MDR1S/MDR1B (Mode Register for LINE/for Shadow/for Border)
Register
DrawBaseAddress + 424
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register sets the mode of line and pixel drawing.
This register is used for the body primitive, for the shade primitive, for the edge primitive.
The value after a drawing that involves the shade primitive, the edge primitive, or the top-left non-
applicable primitive is the value set for MDR1.
Please set ZC bit (bit 2) to 0 when draw BltCopyAltAlphaBlendP command.
Bit 1
AS (Alpha Shading mode)
Sets the shading mode for alpha.
0
1
Bit 2
ZC (Z Compare mode)
Sets Z comparison mode
0
1
Bit 5 to 3
ZCL (Z Compare Logic)
Selects type of Z comparison
000
001
010
011
100
101
110
111
Bit 6
ZW (Z Write mode)
Sets Z write mode
0
1
Bit 8 to 7
BM (Blend Mode)
Sets blend mode
00
01
10
11
18-212
H
LW
BL
BP
RW
RW RW
00000
0 0
Alpha flat shading
Alpha Gouraud shading
Disabled
Enabled
NEVER
ALWAYS
LESS
LEQUAL
EQUAL
GEQUAL
GREATER
NOTEQUAL
Writes Z values.
Not write Z values.
Normal (source copy)
Alpha blending
Drawing with logic operation
Reserved
LOG
BM
ZCL
ZW
ZC AS
RW
RW
RW
RW
RW RW
0011
0
0
0000
0 0
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