MB86296 Datasheet, PDF (279/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
13.2.7 Drawing mode registers
When write to the registers, use the SetRegister command. The registers cannot be accessed from
the CPU.
MDR0 (Mode Register for miscellaneous)
Register
address
DrawBaseAddress + 420H
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
ZP
CF
CY CX
BSV BSH
R/W
RW
RW
RW RW
RW RW
Initial value
0
00
00
00 00
Bit 1 to 0
BSH (Bitmap Scale Horizontal)
Sets horizontal zoom ratio of bitmap draw
00 x1
01 x2
10 x1/2
01 Reserved
Bit 3 to 2
BSV (Bitmap Scale Vertical)
Sets vertical zoom ratio of bitmap draw
00 x1
01 x2
10 x1/2
01 Reserved
Bit 8
CX (Clip X enable)
Sets X coordinates clipping mode
0 Disabled
1 Enabled
Bit 9
CY (Clip Y enable)
Sets Y coordinates clipping mode
0 Disabled
1 Enabled
Bit 16 and 15
CF (Color Format)
Sets drawing color format
00 Indirect color mode (8 bits/pixel)
01 Direct color mode (16 bits/pixel)
Bit 20
ZP (Z Precision)
Sets the precision of the Z value used for erasing hidden planes.
16 bits/pixel
8 bits/pixel
MB86296S <Coral-PA>
269
Specification Manual Rev0.1