Rev. 2.00, 09/03, page 240 of 690
Figure 8.1 shows the block diagram of the DMAC.
On-chip
peripheral module
Peripheral bus
Internal bus
External
ROM
DREQ0, DREQ1
DEIn
DACK0, DACK1
TEND0
External
RAM
External I/O
(memory
mapped)
External I/O
(with
acknowledge-
ment)
Bus
interface
Bus state
controller
Request
priority
control
Start-up
control
Register
control
Transfer count
control
SAR_n
DAR_n
DMATCR_n
CHCR_n
DMAOR
DMARS0
−
1
[Legend]
DMAOR:
DMA operation register
SARn:
DMA source address register
DARn:
DMA destination address register
DMATCRn: DMA transfer count register
CHCRn:
DMA channel control register
DMARS0/1:
DMA extension resource selector
DEIn:
DMA transfer-end interrupt request to the CPU
n : 0, 1, 2, 3
DMAC module
SCIF0, SCIF2
CMT, USB
A/D converter
Figure 8.1 Block Diagram of DMAC
Содержание SH7705
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