Справочник Пользователя для AMD LX 800@0.9W
290
AMD Geode™ LX Processors Data Book
Display Controller
33234H
6.5.5.3
Write Modes
There are four write modes supported by the graphics con-
troller (mode 0, 1, 2, and 3). These write modes provide
troller (mode 0, 1, 2, and 3). These write modes provide
assistance to the CPU when the frame buffer is in a planar
graphics format. Figure 6-17 shows the data flow logic that
supports these modes.
graphics format. Figure 6-17 shows the data flow logic that
supports these modes.
Figure 6-17. Write Mode Data Flow
CPU Data [7:0]
Rotator
Data Rotate [2:0]
Set/Reset [3:0]
3
2
1
0
3
2
1
0
B
WriteMode2
B
B
B
B
Enable Set/Reset [3:0]
3
2
1
0
Bit Mask [7:0]
-A/+A*B
Write Mode 3
A
Read Data Latch [31:0]
ALU
Function [1:0]
31:24
23:16
15:8
7:0
Map 3
Write Data
Map 2
Write Data
Map 1
Write Data
Map 0
Write Data
F
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
D
M
S
D
M
S
D
M
S
D
M
S
N
D
D
Memory Maps
8
8
8
8
8
8
8
8
8
8
8
8
8
8