Section 11 Direct Memory Access Controller (DMAC)
Rev. 2.00 Mar 09, 2006 page 486 of 906
REJ09B0292-0200
11.3.4
DMA Transfer Types
It can operate in single address mode or dual address mode, as defined by how many bus cycles
the DMAC takes to access the transfer source and transfer destination. The actual transfer
operation timing varies with the DMAC bus mode used: cycle-steal mode or burst mode. The
DMAC supports all the transfers shown in table 11.7.
Table 11.7 Supported DMA Transfers
Destination
Source
External
Device with
DACK
External
Memory
Memory-Mapped
External Device
On-Chip
Peripheral
Module
On-Chip
Memory
External device
with DACK
Not available
Single
Single
Not available Not available
External memory
Single
Dual
Dual
Dual
*
Dual
Memory-mapped
external device
Single
Dual
Dual
Dual
*
Dual
On-chip peripheral
module
Not available
Dual
*
Dual
*
Dual
*
Dual
*
On-chip memory
Not available
Dual
Dual
Dual
*
Dual
Single: Single address mode
Dual: Dual address mode
Note:
*
Access size permitted by peripheral module register used as transfer source or transfer
destination (excluding DMAC, BSC, UBC, cache memory, E-DMAC, and EtherC).
Address Modes:
•
Single Address Mode
In single address mode, both the transfer source and destination are external; one (selectable) is
accessed by a DACKn signal while the other is accessed by address. In this mode, the DMAC
performs the DMA transfer in one bus cycle by simultaneously outputting a transfer request
acknowledge DACKn signal to one external device to access it, while outputting an address to
the other end of the transfer. Figure 11.6 shows an example of a transfer between external
memory and external device with DACK. That data is written in external memory in the same
bus cycle while the external device outputs data to the data bus.
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 ...