Hitachi SH7095 Hardware User Manual page 253

Table 9.7 Supported DMA Transfers
Source
External device with DACK
External memory
Memory-mapped external device Single
On-chip peripheral module
Single: Single address mode
Dual: Dual address mode
Note: Access size enabled by the register of the on-chip peripheral module that is the source or
destination (excludes DMAC, BSC, and UBC).
Address Modes:
• Single Address Mode
In the single address mode, both the transfer source and destination are external; one
(selectable) is accessed by a DACK 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 DACK signal to one external device to access it while
outputting an address to the other end of the transfer. Figure 9.6 shows an example of a
transfer between an external memory and an external device with DACK. The external device
outputs data to the data bus while that data is written in external memory in the same bus
cycle.
242 Hitachi
External
Device with External
DACK Memory
Not available Single
Single Dual
Dual
Not available Dual
Destination
Memory-Mapped
External Device
Single
Dual
Dual
Dual
On-Chip
Peripheral
Module
Not available
Dual
Dual
Dual*