SC2200 datasheet(302/433 Pages) NSC

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302

Revision 3.0

Core Logic Module (Continued)

Channel 2 Terminal Count. Indicates if TC was reached.

0: No.

1: Yes.

Channel 1 Terminal Count. Indicates if TC was reached.

0: No.

1: Yes.

Channel 0 Terminal Count. Indicates if TC was reached.

0: No.

1: Yes.

Write

DMA Command Register, Channels 3:0

DACK Sense.

0: Active high.

1: Active low.

DREQ Sense.

0: Active high.

1: Active low.

Write Selection.

0: Late write.

1: Extended write.

Priority Mode.

0: Fixed.

1: Rotating.

Timing Mode.

0: Normal.

1: Compressed.

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.

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.

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 5-43. DMA Channel Control Registers (Continued)

Bit

Description

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