SH7721 datasheet(496/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 10

Direct Memory Access Controller (DMAC)

Rev. 3.00 Jan. 18, 2008 Page 434 of 1458

REJ09B0033-0300

10.4.4

DMA Transfer Types

DMA transfer has two types; single address mode transfer and dual address mode transfer. They

depend on the number of bus cycles of access to source and destination. A data transfer timing

depends on the bus mode, which has cycle steal mode and burst mode. The DMAC supports the

transfers shown in table 10.7.

Table 10.7

Supported DMA Transfers

Destination

Source

External

Device with

DACK

External

Memory

Memory-

Mapped

External

Device

On-Chip

Peripheral

Module

X/Y Memory

U Memory

External device with DACK

Not

available

Dual,

single

Dual,

single

Not

available

Not

available

External memory

Dual, single Dual

Dual

Memory-mapped external

device

Dual, single Dual

Dual

On-chip peripheral module

Not

available

Dual

X/Y memory

Not

available

Dual

Notes: 1. Dual: Dual address mode

2. Single: Single address mode

3. For on-chip peripheral modules, 16-byte transfer is available only by registers which

can be accessed in longword units.

SH7721 Datasheet(PDF) 496 Page - Renesas Technology Corp

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