Section 7 DMA Controller (DMAC)
Rev. 3.00 Mar. 14, 2006 Page 162 of 804
REJ09B0104-0300
7.4.2 Transfer
Modes
(1)
Normal Transfer Mode
In normal transfer mode, one data access size of data is transferred at a single transfer request. Up
to 4 Gbytes can be specified as a total transfer size by DTCR. DBSR is ignored in normal transfer
mode.
The
TEND
signal is output only in the last DMA transfer.
Figure 7.7 shows an example of the signal timing in normal transfer mode and figure 7.8 shows
the operation in normal transfer mode.
Read
Write
Read
Write
DMA transfer
cycle
Last DMA
transfer cycle
Bus cycle
Auto request transfer in dual address mode:
External request transfer in single address mode:
TEND
DMA
DMA
DREQ
Bus cycle
DACK
Figure 7.7 Example of Signal Timing in Normal Transfer Mode
Transfer
Total transfer
size (DTCR)
Address T
A
Address B
A
Address T
B
Address B
B
Figure 7.8 Operations in Normal Transfer Mode
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