MC68340 datasheet(278/441 Pages) FREESCALE

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6- 28

MC68340 USER’S MANUAL

MOTOROLA

Dual-Address Mode—This bit defines which device generates requests.

1 = If request generation is programmed to be external (REQ = 1x), the source

device generates the request, and the control signals (

DREQ

≈, DACK≈, and

DONE

≈) are part of the source (read) portion of the transfer.

0 = If request generation is programmed to be external (REQ = 1x), the destination

device generates the request, and the control signals (

DREQ

≈, DACK≈, and

DONE

≈) are part of the destination (write) portion of the transfer.

SAPI—Source Address Pointer Increment

1 = The SAR is incremented by 1, 2, or 4 after each transfer, according to the source

size. The address that is written into the SAR points to a memory block and is

incremented to complete the data transfer.

0 = The SAR is not incremented during operand transfer. The address that is written

into the SAR points to a peripheral device and is used for the complete data

transfer.

DAPI—Destination Address Pointer Increment

1 = The DAR is incremented by 1, 2, or 4 after each transfer, according to the source

size. The address that is written into the DAR points to a memory block and is

incremented to complete the data transfer.

0 = The DAR is not incremented during operand transfer. The address that is written

into the DAR points to a peripheral device and is used for the complete data

transfer.

SSIZE—Source Size Control Field

This field controls the size of the source (read) bus cycle that the DMA channel is

running. Table 6-2 defines these bits.

Table 6-2. SSIZEx Encoding

Bit 9

Bit 8

Definition

Long Word*

Byte

Word

Not Used

*External logic is required to complete a long-

word transfer.

Freescale Semiconductor, Inc.

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