Figure 6-17. Write Mode Data Flow - AMD Geode LX 600@0.7W Data Book

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
CPU Data [7:0]
Data Rotate [2:0]
Set/Reset [3:0]
WriteMode2
Enable Set/Reset [3:0]
Bit Mask [7:0]
Write Mode 3
Read Data Latch [31:0]
Function [1:0]
290
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.
Rotator
8
8
A
N
3
D
A B
B
A B
-A/+A*B
8
31:24
8
D M S
F
Map 3
Write Data

Figure 6-17. Write Mode Data Flow

Memory Maps
3 2 1
3 2 1
8 8
A B A B A B
B
8
2 1
A B A
B B
23:16 15:8
8 8
D M S D M S
Map 2 Map 1
Write Data Write Data
AMD Geode™ LX Processors Data Book
Display Controller
0
0
8 8
A B
8 8
0
B A B
B
7:0
8
D M S
ALU
Map 0
Write Data