Section 7 DMA Controller (DMAC)
Rev. 3.00 Mar. 14, 2006 Page 185 of 804
REJ09B0104-0300
(2)
Normal Transfer Mode (Burst Mode)
In burst mode, one byte, one word, or one longword of data continues to be transferred until the
transfer end condition is satisfied.
When a burst transfer starts, a transfer request from a channel having priority is suspended until
the burst transfer is completed.
In figure 7.27, the
TEND
signal output is enabled and data is transferred in words from the
external 16-bit 2-state access space to the external 16-bit 2-state access space in normal transfer
mode by burst access.
DMA
read cycle
DMA
read cycle
DMA
write cycle
Address
bus
DMA
write cycle
DMA
read cycle
DMA
write cycle
B
φ
RD
HHWR
,
HLWR
LHWR
,
LLWR
TEND
Bus
released
Bus
released
Last transfer cycle
Burst transfer
High
Figure 7.27 Example of Transfer in Normal Transfer Mode by Burst Access
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