HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 497
HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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In dual address mode, both the transfer source and destination are accessed by an address. The
source and destination can be located externally or internally.
DMA transfer requires two bus cycles because data is read from the transfer source in a data read
cycle and written to the transfer destination in a data write cycle. At this time, transfer data is
temporarily stored in the DMAC. In the transfer between external memories as shown in figure
10.5, data is read to the DMAC from one external memory in a data read cycle, and then that data
is written to the other external memory in a write cycle.
Auto request, external request, and on-chip peripheral module request are available for the transfer
request. DACK can be output in read cycle or write cycle in dual address mode. The channel
control register (CHCR) can specify whether the DACK is output in read cycle or write cycle.
Address Modes
Dual Address Mode
The SAR value is an address, data is read from the transfer source module,
and the data is temporarily stored in the DMAC.
The DAR value is an address and the value stored in the data buffer in the
DMAC is written to the transfer destination module.
Data buffer
Data buffer
Figure 10.5
DMAC
DMAC
SAR
DAR
SAR
DAR
Data Flow of Dual Address Mode
Second bus cycle
First bus cycle
Section 10
Transfer destination
Transfer destination
Transfer source
Transfer source
Rev. 3.00 Jan. 18, 2008 Page 435 of 1458
Memory
Memory
module
module
module
module
Direct Memory Access Controller (DMAC)
REJ09B0033-0300
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