Transfer Modes; Figure 7.7 Example Of Signal Timing In Normal Transfer Mode; Figure 7.8 Operations In Normal Transfer Mode - Renesas H8SX/1520 Series Hardware Manual

Section 7 DMA Controller (DMAC)
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.
Auto request transfer in dual address mode:
External request transfer in single address mode:
Address T
Address B
Rev. 3.00 Mar. 14, 2006 Page 162 of 804
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Bus cycle
TEND
DREQ
Bus cycle
DACK

Figure 7.7 Example of Signal Timing in Normal Transfer Mode

A
A

Figure 7.8 Operations in Normal Transfer Mode

DMA transfer Last DMA
cycle transfer cycle
Read Write Read
DMA
Transfer
Total transfer
size (DTCR)
Write
DMA
Address T
Address B
B
B