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Chapter 26 DMA Controller
6.DMA External Interface
Figure 6-3 Timing Chart in 2-Cycle Transfer Mode
●Fly-by transfer mode
Figure 6-4"Timing Chart in Fly-By Transfer Mode" shows the timing chart in fly-by transfer mode.
Figure 6-4 Timing Chart in Fly-By Transfer Mode
RD
DQMU/L
WR/WRn
DACK (AKxx=111B)*
Same timing as the chip select
DACK (AKxx=001B)*2-cycle transfer setting disabled
DACK (AKxx=100B)*
DACK (AKxx=101B)*
* : AKxx is the setting value in the PFR register that corresponds to the DMA channel.
DACK (AKxx=010B)*
DACK (AKxx=011B)*
DACK (AKxx=110B)*
RD
DQMU/L
WR/WRn
IORD
IOWR
DACK(AKxx=111B)
*
Same timing as the chip select
DACK(AKxx=001B)*
DACK(AKxx=010B)* Fly-by transfer setting disabled
DACK(AKxx=011B)* Fly-by transfer setting disabled
DACK(AKxx=100B)* Fly-by transfer setting disabled
Memory to I/O
I/O to memory
Memory to I/O I/O to memory
* : AKxx is the setting value in the PFR register that corresponds to the DMA channel.
DACK(AKxx=101B)* Fly-by transfer setting disabled
DACK(AKxx=110B)* Fly-by transfer setting disabled