Section 14 Direct Memory Access Controller (DMAC)
Rev.1.00 Dec. 13, 2005 Page 596 of 1286
REJ09B0158-0100
Auto request, external request, and peripheral module request are available for the transfer request.
DACK can be output in read cycle or write cycle in dual address mode. CHCR can specify
whether the DACK is output in read cycle or write cycle.
Figure 14.5 shows an example of DMA transfer timing in dual address mode.
CLKOUT
A25 to A0
Note: In transfer between external memories, with DACK output in the read cycle,
DACK output timing is the same as that of
CSn
.
D31 to D0
WE
RD
DACK
Low-active
CSn
Transfer source
address
Transfer destination
address
Data read cycle
Data write cycle
(1st cycle)
(2nd cycle)
Figure 14.5 Example of DMA Transfer Timing in Dual Address Mode
(Source: Ordinary Memory, Destination: Ordinary Memory)
Содержание SH7780 Series
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