MB86296 Datasheet, PDF (305/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
13.2.16 Geometry mode registers
The SetRegister command is used to write values to geometry mode registers. The geometry mode
registers cannot be accessed from the CPU.
GMDR0 (Geometry Mode Register for Vertex)
Register
address
GeometryBaseAddress + 40H
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
FX
CF DF ST Z C F
R/W
RW
RW RW RW RW RW RW
Initial value
0
000 0 0 0 0
This register sets the types of parameters input as vertex data and the type of projective
transformation.
Bit28
FX (Float Setup eXpand)
Enable Float Setup mode (See Geometry command code table)
Work Only for G_Begin/Triangle(s,_Strip,_Fan)
0 disable
1 enable
Bit 7
CF (Color Format)
Specifies color data format
0 Independent RGB format/Packed RGB format
1 Reserved
Bit 6 and 5
DF (Data Format)
Specifies vertex coordinates data format
00 Specifies floating-point format (Only independent RGB format can be used as color
data format.)
01 Specifies fixed-point format (Only packed RGB format can be used as color data
format.)
10 Reserved
11 Specifies packed integer format (Only packed RGB format can be used as color
data format.)
CF DF Input data format
0 00 Floating-point format + independent RGB format
01 Fixed-point format + packed RGB format
10 Reserved
11 Packed integer format + packed RGB format
1 00 Reserved
01 Reserved
10 Reserved
11 Reserved
MB86296S <Coral-PA>
295
Specification Manual Rev0.1