3 write modes, Figure 6-17, Write mode data flow – AMD Geode LX [email protected] User Manual
Page 290
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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
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.
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
Memory Maps
8
8
8
8
8
8
8
8
8
8
8
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8
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