MPC8280 datasheet(666/1386 Pages) FREESCALE

666 / 1386 page

SDMA Channels and IDMA Emulation

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

19-20

Freescale Semiconductor

19.8.2.2

Data Transfer Types as Programmed in DCM

Table 19-6 summarizes the types of data transfers according to the DCM programming.

19.8.2.3

Programming DTS and STS

The options for setting STS and DTS depend on (DCM[DMA_WRAP]) and are described in the following

tables for memory/memory and memory/peripheral transfers.

Table 19-7 describes valid STS/DTS values for memory-to-memory operations.

Table 19-6. IDMA Channel Data Transfer Operation

S/D

Read From

Write To

Description (Steady-State Operation)

Memory

(STS = SS_MAX)

Peripheral

(DTS = port size

or 32)

Read from memory: Filling internal buffer in one DMA transfer.

On the bus: one burst or more, depends on STS

Write to peripheral: In smaller transfers until internal buffer empties.

On the bus: singles or burst, depends on DTS

Peripheral

(STS = port size or

32)

Memory

(DTS =

SS_MAX)

Read from peripheral: Filling internal buffer in several DMA

transfers.

On the bus: singles or burst, depends on STS

Write to memory: in one DMA transfer, internal buffer empties.

On the bus: one burst or more, depends on DTS

Memory

(STS = SS_MAX)

Memory

(DTS =

SS_MAX or

less)

Read from memory: Filling internal buffer in one DMA transfer.

On the bus: one burst or more, depends on STS

Write to memory: in one transfer or more until internal buffer

empties.

On the bus: singles or bursts, depends on DTS

Memory

(STS = SS_MAX

or less)

Memory

(DTS =

SS_MAX)

Read from memory: Filling internal buffer in one or more DMA

transfers.

On the bus: singles or bursts, depends on STS

Write to memory: in one DMA transfer, internal buffer empties.

On the bus: one burst or more, depends on DTS

Memory to

peripheral

(DTS = port size or

32)

—

Read transaction from memory while asserting DACK to

peripheral. Peripheral samples the data read from memory.

On the bus: singles or bursts, depends on DTS

—

Peripheral to

memory

(STS = port size

or 32)

Write transaction to memory while asserting DACK to peripheral.

Peripheral provides the data that is written to the memory.

On the bus: singles or bursts, depends on STS

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