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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
L
M
H
L
M
H
L
M
H
L
M
H
Even address
Transfer
parameters
for
1
block
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
L
M
H
L
M
H
L
M
H
Even address
Transfer
parameters
for
1
block
Dummy data
Even address
Next transfer
parameter memory’s
start address