AMD Geode SC1201 User Manual
Page 297
AMD Geode™ SC1200/SC1201 Processor Data Book
297
Core Logic Module - ISA Legacy Register Space
32579B
2
Channel 2 Terminal Count. Indicates if TC was reached.
0: No.
1: Yes.
1
Channel 1 Terminal Count. Indicates if TC was reached.
0: No.
1: Yes.
0
Channel 0 Terminal Count. Indicates if TC was reached.
0: No.
1: Yes.
Write
DMA Command Register, Channels 3:0
7
DACK Sense.
0: Active low.
1: Active high.
6
DREQ Sense.
0: Active high.
1: Active low.
5
Write Selection.
0: Late write.
1: Extended write.
4
Priority Mode.
0: Fixed.
1: Rotating.
3
Timing Mode.
0: Normal.
1: Compressed.
2
Channels 3:0.
0: Disable.
1: Enable.
1:0
Reserved. Must be set to 0.
I/O Port 009h
Software DMA Request Register, Channels 3:0 (W)
7:3
Reserved. Must be set to 0.
2
Request Type.
0: Reset.
1: Set.
1:0
Channel Number Request Select
00: Channel 0.
01: Channel 1.
10: Channel 2.
11: Channel 3.
I/O Port 00Ah
DMA Channel Mask Register, Channels 3:0 (WO)
7:3
Reserved. Must be set to 0.
2
Channel Mask.
0: Not masked.
1: Masked.
1:0
Channel Number Mask Select.
00: Channel 0.
01: Channel 1.
10: Channel 2.
11: Channel 3.
Table 6-43. DMA Channel Control Registers (Continued)
Bit
Description