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MB86R02 'Jade-D' Hardware Manual V1.64
MDR2/MDR2S/MDR2TL (Mode Register for Polygon/for Shadow/for TopLeft)
Register
DrawBaseAddress + 428
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
RW
Initial value
This register sets the polygon drawing mode.
This register is used for the body primitive, for the shade primitive and for the top-left non-
applicable primitive.
The value after a drawing that involves the shade primitive or the top-left non-applicable primitive is
the value set for MDR2.
(Must set SM=AS=TT=0 for MDR2S)
Bit 0
SM (Shading Mode)
Sets shading mode
0
1
Bit 1
AS (Alpha Shading mode)
Sets alpha shading mode. This mode is enabled for only 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 mask)
Sets Z write mode
0
1
18-214
H
TT
00
Flat shading
Gouraud shading
Alpha flat shading
Alpha gouraud shading
Disabled
Enabled
NEVER
ALWAYS
LESS
LEQUAL
EQUAL
GEQUAL
GREATER
NOTEQUAL
Writes Z values
Not write Z values
LOG
BM
ZCL
ZW
ZC AS SM
RW
RW
RW
RW
RW RW RW
0011
0
0
0000
0 0 0
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