SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 305

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

Revision 3.0
Core Logic Module
I/O Port 0D2h
I/O Port 0D4h
I/O Port 0D6h
I/O Port 0D8h
I/O Port 0DAh
I/O Port 0DCh
I/O Port 0DEh
7:3
1:0
7:3
1:0
7:6
3:2
1:0
Bit
2
2
5
4
Description
Reserved. Must be set to 0.
Request Type.
0: Reset.
1: Set.
Channel Number Request Select.
00: Illegal.
01: Channel 5.
10: Channel 6.
11: Channel 7.
Reserved. Must be set to 0.
Channel Mask.
0: Not masked.
1: Masked.
Channel Number Mask Select.
00: Channel 4.
01: Channel 5.
10: Channel 6.
11: Channel 7.
Transfer Mode.
00: Demand.
01: Single.
10: Block.
11: Cascade.
Address Direction.
0: Increment.
1: Decrement.
Auto-initialize.
0: Disabled
1: Enable
Transfer Type.
00: Verify.
01: Memory read.
10: Memory write.
11: Reserved.
Channel Number Mode Select.
00: Channel 4.
01: Channel 5.
10: Channel 6.
11: Channel 7.
Channel 4 must be programmed in cascade mode. This mode is not the default.
Table 5-43. DMA Channel Control Registers (Continued)
(Continued)
DMA Clear Mask Register Command, Channels 7:4 (W)
DMA Write Mask Register Command, Channels 7:4 (W)
DMA Clear Byte Pointer Command, Channels 7:4 (W)
Software DMA Request Register, Channels 7:4 (W)
DMA Channel Mode Register, Channels 7:4 (WO)
DMA Channel Mask Register, Channels 7:4 (WO)
DMA Master Clear Command, Channels 7:4 (W)
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