SH7041A datasheet(283/923 Pages) RENESAS

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11.3.8

Relationship between Request Modes and Bus Modes by DMA Transfer Category

Table 11.6 shows the relationship between request modes and bus modes by DMA transfer

category.

Table 11.6

Relationship of Request Modes and Bus Modes by DMA Transfer Category

Address

Mode

Transfer Category

Request

Mode

Bus*

Mode

Transfer

Size (Bits)

Usable

Channels

Single

External device with DACK and

external memory

External

B/C

8/16/32

0, 1

External device with DACK and

memory-mapped external device

External

B/C

8/16/32

0, 1

Dual

External memory and external memory

Any*

B/C

8/16/32

0–3*

External memory and memory-mapped

external device

Any*

B/C

8/16/32

0–3*

Memory-mapped external device and

memory-mapped external device

Any*

B/C

8/16/32

0–3*

External memory and on-chip memory

Any*

B/C

8/16/32

0–3*

External memory and on-chip

peripheral module

Any*

B/C*

8/16/32*

0–3*

Memory-mapped external device and

on-chip memory

Any*

B/C

8/16/32

0–3*

Memory-mapped external device and

on-chip peripheral module

Any*

B/C*

8/16/32*

0–3*

On-chip memory and on-chip memory

Any*

B/C

8/16/32

0–3*

On-chip memory and on-chip

peripheral module

Any*

B/C*

8/16/32*

0–3*

On-chip peripheral module and on-

chip peripheral module

Any*

B/C*

8/16/32*

0–3*

Notes: *1 External request, auto-request or on-chip peripheral module request enabled. However,

in the case of on-chip peripheral module request, it is not possible to specify the SCI or

A/D converter for the transfer request source.

*2 External request, auto-request or on-chip peripheral module request possible. However,

if transfer request source is also the SCI or A/D converter (A/D1 for A mask), the

transfer source or transfer destination must be the SCI or A/D converter (A/D1 for A

mask). For A mask, setting A/D0 as the transfer request source is not permitted.

*3 When the transfer request source is the SCI, only cycle steal mode is possible.

*4 Access size permitted by register of on-chip peripheral module that is the transfer

source or transfer destination.

*5 When the transfer request is an external request, channels 0 and 1 only can be used.

*6 B: Burst, C: Cycle steal

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