Samsung S3C2500B User Manual page 514

S3C2500B
The following is the problem solving with software.
1. Method 1
DPRIR Channel
0 GDMA 0
0 GDMA 1
0 GDMA 2
0
0
0
Writing "0x000330", instead of "0x0" will give each channel of three GDMA with the same amount of bus
occupancy.
2. Method 2
DPRIR Channel
0 GDMA 0
0 GDMA 1
0 GDMA 2
0
0
0
With leaving DPRIR as "0x0" and using every other channel, each channel of three GDMA gets the same bus
occupancy, as seen above.
Expected
Bus System Bus
Occupancy Occupancy
1/3
1/3
1/3
0
0
0
Problem
Expected
Bus System Bus
Occupancy Occupancy
1/3
1/3
1/3
0
0
0
Problem
Real DPRIR
4/6
1/6
⇒
1/6
0
0
0
Real DPRIR
4/6
1/6
⇒
1/6
0
0
0
GDMA CONTROLLER
Channel
0 GDMA 0
3 GDMA 1
3 GDMA 2
0
0
0
Problem Solving by Method 1
Channel
0 GDMA 0
0
0 GDMA 2
0
0 GDMA 4
0
Problem Solving by Method 2
Occupancy
1/3
1/3
1/3
0
0
0
Occupancy
1/3
0
1/3
0
1/3
0
12-7