H8SXSLASH1663M datasheet(513/1504 Pages) RENESAS

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Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 481 of 1468

REJ09B0412-0200

11.4.2

Cluster Transfer Modes

Table 11.5 shows cluster transfer modes. Cluster transfer mode can be set independently for each

channel. The cluster buffer is common to all channels.

Table 11.5

Cluster Transfer Mode

Address Mode

Activation Source

Common Function

Transfer

Source

Cluster

Buffer

Function

Transfer

Destination

Cluster transfer

Dual address mode

EDSAR

Read from

the transfer

source and

written to

the transfer

destination

EDDAR

Cluster transfer

Read address mode

(DIRS = 0)

EDSAR

Read from

the transfer

source



Cluster transfer

Write address mode

(DIRS = 1)

•

Auto-request

(activated by

the CPU)

•

External

request

•

Cluster size

One access size

(byte/word/longword)

to 32 bytes

•

Total transfer size

1 to 4 Gbytes, or no

specification

•

Offset addition

•

Extended repeat

area function



Written to

the transfer

destination

EDDAR

In cluster transfer mode, the specified cluster size is transferred in response to a single transfer

request. The cluster size can be from one access size (byte, word, or longword) to 32 bytes. Within

a cluster, a cluster-size transfer is performed in burst transfer mode. With a cluster-size access in

cluster transfer mode (dual address mode), block transfer mode (dual address mode) is used.

With auto-requests, cycle steal mode is set.

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