HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 315
HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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Two kinds of transfer are possible in the single address mode: (1) transfer between an external
device with DACK and a memory-mapped external device, and (2) transfer between an external
device with DACK and external memory. In both cases, only the external request signal (DREQ) is
used for transfer requests.
Single Address Mode
In the single address mode, either the transfer source or transfer destination external 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, as shown in
figure 9.11, when the external device outputs data to the data bus, that data is written to the
external memory in the same bus cycle.
SH7706
Data flow
Figure 9.11 Data Flow in the Single Address Mode
DMAC
External address bus
DACK
DREQ
External data bus
Rev. 4.00, 03/04, page 269 of 660
External device
with DACK
External
memory
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