Dma Transfer Types - Hitachi SH7709S Hardware Manual

11.3.4

DMA Transfer Types

The DMAC supports the transfers shown in table 11.5. Dual address mode has a direct address
mode and indirect address mode. In direct address mode, an output address value is the data
transfer target address; in indirect address mode, the value stored in the output address, not the
output address value itself, is the data transfer target address. Data transfer timing depends on the
bus mode, which may be cycle-steal mode or burst mode.
Table 11.5 Supported DMA Transfers
Source
External device with
DACK
External memory
Memory-mapped
external device
On-chip peripheral
module
Notes: 1. Dual: Dual address mode
2. Single: Single address mode
3. Dual address mode includes direct address mode and indirect address mode.
4. 16-byte transfer is not available for on-chip peripheral modules.
Address Modes:
• Dual Address Mode
In dual address mode, both the transfer source and destination are accessed (selectable) by an
address. The source and destination can be located externally or internally. Dual address mode
has (1) a direct address transfer mode and (2) an indirect address transfer mode.
356
External Device External
with DACK Memory
Not available Dual, single
Dual, single Dual
Dual, single Dual
Not available Dual
Destination
Memory-
Mapped External
Device
Dual, single
Dual
Dual
Dual
On-Chip
Peripheral
Module
Not available
Dual
Dual
Dual