Section 11 Direct Memory Access Controller (DMAC)
Rev. 2.00 Mar 09, 2006 page 489 of 906
REJ09B0292-0200
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Dual Address Mode
In dual address mode, both the transfer source and destination are accessed (selectable) by
address. The source and destination can be located externally or internally. The DMAC
accesses the source in the read cycle and the destination in the write cycle, so the transfer is
performed in two separate bus cycles. The transfer data is temporarily stored in the DMAC.
Figure 11.8 shows an example of a transfer between two external memories in which data is
read from one external memory in the read cycle and written to the other external memory in
the following write cycle.
DMAC
External
memory
External
memory
Chip
2
1
External data bus
: Data flow
1: Read cycle
2: Write cycle
Figure 11.8 Data Flow in Dual Address Mode
In dual address mode transfers, external memory and memory-mapped external devices can be
mixed without restriction. Specifically, this enables transfers between the following:
Transfer between external memory and external memory
Transfer between external memory and memory-mapped external device
Transfer between memory-mapped external device and memory-mapped external device
Transfer between external memory and on-chip peripheral module (excluding DMAC,
BSC, UBC, cache, E-DMAC, and EtherC)*
Transfer between memory-mapped external device and on-chip peripheral module
(excluding DMAC, BSC, UBC, cache, E-DMAC, and EtherC)*
Transfer between on-chip memory and on-chip memory
Transfer between on-chip memory and memory-mapped external device
Transfer between on-chip memory and on-chip peripheral module (excluding DMAC,
BSC, UBC, cache, E-DMAC, and EtherC)*
Содержание SH7616
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Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...