7721 datasheet(362/577 Pages) RENESAS

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DMA CONTROLLER

13.8 Link array chain transfer mode

13-83

7721 Group User‘s Manual

Fig. 13.8.2 Transfer parameter memory map in link array chain transfer mode

V The above applies on the following conditions:

•When data is transferred from memory to I/O

(When transferring from I/O to memory, replace all the above mentioned “Transfer source’s

transfer start address” with “Transfer destination’s transfer start address.”

•4-block transfer

V The above figure applies when 4-block transfer is performed.

Dummy data

Transfer parameter address 1

(1) 2-bus cycle transfer

(2) 1-bus cycle transfer

4 bytes

Transfer source’s transfer start address 1

Transfer destination’s transfer start address 1

Transfer data’s byte number 1

Next transfer parameter memory’s start address 2

Transfer source’s transfer start address 4

Transfer destination’s transfer start address 4

Transfer data’s byte number 4

“00000016”

Transfer source’s transfer start address 3

Transfer destination’s transfer start address 3

Transfer data’s byte number 3

Next transfer parameter memory’s start address 4

Transfer source’s transfer start address 2

Transfer destination’s transfer start address 2

Transfer data’s byte number 2

Next transfer parameter memory’s start address 3

Transfer parameter

address 4 (last block)

Transfer parameter address 3

Transfer parameter address 2

Dummy data

Transfer data’s

byte number

Transfer source’s

transfer start

address

Even address

Dummy data

Even address

Transfer

destination’s transfer

start address

Next transfer

parameter memory’s

start address

4 bytes

Transfer source’s transfer start address 1

Transfer data’s byte number 1

Next transfer parameter memory’s start address 2

Transfer source’s transfer start address 3

Transfer data’s byte number 3

Next transfer parameter memory’s start address 4

Transfer source’s transfer start address 2

Transfer data’s byte number 2

Next transfer parameter memory’s start address 3

Transfer source’s transfer start address 4

Transfer data’s byte number 4

“00000016”

Transfer parameter address 1

Transfer parameter

address 3

Transfer parameter address 2

Transfer parameter

address 4 (last block)

Dummy data

Transfer data’s

byte number

Transfer source’s

transfer start

address

Even address

Dummy data

Even address

Next transfer

parameter memory’s

start address

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