TMPR4937 datasheet(160/552 Pages) TOSHIBA

tên linh kiện	TMPR4937

Giải thích chi tiết về linh kiện	64-Bit TX System RISC TX49 Family

PDF	552 Pages

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nhà sản xuất	TOSHIBA [Toshiba Semiconductor]

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Chapter 8 DMA Controller

8-4

8.3

Detailed Explanation

8.3.1

Transfer Mode

The DMA Controller (DMAC0, DMAC1) supports five transfer mode types (refer to Table 8.3.1

below). The setting of the External Request bit (DMCCRn.EXTRQ) of the DMA Channel Control

•

I/O DMA Transfer Mode (DMCCRn.EXTRQ = “1”)

Perform DMA transfer with either an external device connected to the External Bus Controller or

an on-chip I/O device (ACLC or SIO).

•

Memory Transfer Mode (DMCCRn.EXTRQ = “0”)

Either copies data between memory devices or fills data in memory.

Table 8.3.1 DMA Controller Transfer Modes

DMA

Controller

Transfer Mode

DMCCRn

EXTREQ

PCFG

DMASEL

DMCCRn

SNGAD

DMSAR

DMDAR

Ref.

External I/O

(Single Address)

√

⎯

8.3.3

8.3.7

External I/O

(Dual Address)

√

8.3.3

8.3.8

Internal I/O (SIO)

√

8.3.4

8.3.8

Memory-Memory Copy

⎯

√

8.3.4

8.3.8

DMAC0

Fill Memory

⎯

√

⎯

8.3.6

8.3.7

Internal I/O (ACLC)

⎯

√

8.3.4

8.3.8

Memory-Memory Copy

⎯

√

8.3.4

8.3.8

DMAC1

Fill Memory

⎯

√

⎯

8.3.6

8.3.7

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