MB86294 Datasheet, PDF (222/305 Pages) Fujitsu Component Limited. – Grraphiics Controller specifications

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
MDR2/MDR2S/MDR2TL (Mode Register for Polygon/for Shadow/for TopLeft)
Register
address
DrawBaseAddress + 428H
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
TT
LOG
BM ZW ZCL ZC AS SM
R/W
RW
RW
RW RW RW RW RW RW
Initial value
00
0011
0 0 0000 0 0 0
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.
MDR2S register is able to use only SM=0, AS=0 and TT=00 settings.
Bit 0
SM (Shading Mode)
Sets shading mode
0
Flat shading
1
Gouraud shading
Bit 1
AS (Alpha Shading mode)
Sets alpha shading mode. This mode is enabled for only alpha.
0
Alpha flat shading
1
Alpha gouraud shading
Bit 2
ZC (Z Compare mode)
Sets Z comparison mode
0
Disabled
1
Enabled
Bit 5 to 3
ZCL (Z Compare Logic)
Selects type of Z comparison
000 NEVER
001 ALWAYS
010 LESS
011 LEQUAL
100 EQUAL
101 GEQUAL
110 GREATER
111 NOTEQUAL
Bit 6
ZW (Z Write mask)
Sets Z write mode
0
Writes Z values
1
Not write Z values
MB86294/294S CORAL_LB
Graphics Controller
222
Specifications Rev. 1.0