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Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 434 of 982
REJ09B0023-0400
Figure 13.6 shows an example of DMA transfer timing in dual address mode.
CKIO
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
WEn
RD
DACKn
(Active-Low)
CSn
Transfer source
address
Transfer destination
address
Data read cycle
Data write cycle
(1st cycle)
(2nd cycle)
Figure 13.6 Example of DMA Transfer Timing in Dual Mode
(Source: Ordinary Memory, Destination: Ordinary Memory)
2. Single Address Mode
In single address mode, either the transfer source or transfer destination peripheral device is
accessed (selected) by means of the
DACK
signal, and the other device is accessed by address.
In this mode, the DMAC performs one DMA transfer in one bus cycle, accessing one of the
external devices by outputting the
DACK
transfer request acknowledge signal to it, and at the
same time outputting an address to the other device involved in the transfer. For example, in
the case of transfer between external memory and an external device with
DACK
shown in
figure 13.7, when the external device outputs data to the data bus, that data is written to the
external memory in the same bus cycle.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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