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Chapter 26 DMA Controller
1.Overview of the DMA Controller (DMAC)
■ Block Diagram
Figure 1-1"Block Diagram of the DMA Controller (DMAC)" is a block diagram of the DMA controller (DMAC).
Figure 1-1 Block Diagram of the DMA Controller (DMAC)
State
transition
circuit
DMA control
BLK register
DTC 2-stage register
DTCR
DSAD 2-stage register
DDAD 2-stage register
TYPE.MOD,WS
DSS[3:0]
ERIR,EDIR
SADM,SASZ[7:0]
DADM,DASZ[7:0]
SADR
DADR
Read
Write
Access
address
Selector
SelectorSelector
Counter
X-bus
To interrupt controller
IRQ[4:0]
Priority circuit
Peripheral activation request/stop input
Write back
Write back
Buffer
Selector
Counter
Buffer
MCLREQ
Read/write
control
To bus
controller
DMA transfer request to
the bus controller
DMA activation
source
selection circuit
& request
acceptance
control
External pin activation request/stop input
Peripheral interrupt clear
Bus control unit
Bus control unit
Address counter
Counter buffer Counter buffer
Write back