SC2200 datasheet(303/433 Pages) NSC

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Core Logic Module (Continued)

I/O Port 00Bh

DMA Channel Mode Register, Channels 3:0 (WO)

7:6

Transfer Mode.

00: Demand.

01: Single.

10: Block.

11: Cascade.

Address Direction.

0: Increment.

1: Decrement.

Auto-initialize.

0: Disable.

1: Enable.

3:2

Transfer Type.

00: Verify.

01: Memory read.

10: Memory write.

11:

Reserved.

1:0

Channel Number Mode Select.

00: Channel 0.

01: Channel 1.

10: Channel 2.

11: Channel 3.

I/O Port 00Ch

DMA Clear Byte Pointer Command, Channels 3:0 (W)

I/O Port 00Dh

DMA Master Clear Command, Channels 3:0 (W)

I/O Port 00Eh

DMA Clear Mask Register Command, Channels 3:0 (W)

I/O Port 00Fh

DMA Write Mask Register Command, Channels 3:0 (W)

I/O Port 0C0h

DMA Channel 4 Address Register (R/W)

Not used.

I/O Port 0C2h

DMA Channel 4 Transfer Count Register (R/W)

Not used.

I/O Port 0C4h

DMA Channel 5 Address Register (R/W)

Memory address bytes 1 and 0.

I/O Port 0C6h

DMA Channel 5 Transfer Count Register (R/W)

Transfer count bytes 1 and 0.

I/O Port 0C8h

DMA Channel 6 Address Register (R/W)

Memory address bytes 1 and 0.

I/O Port 0CAh

DMA Channel 6 Transfer Count Register (R/W)

Transfer count bytes 1 and 0.

I/O Port 0CCh

DMA Channel 7 Address Register (R/W)

Memory address bytes 1 and 0.

I/O Port 0CEh

DMA Channel 7 Transfer Count Register (R/W)

Transfer count bytes 1 and 0.

Table 5-43. DMA Channel Control Registers (Continued)

Bit

Description

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