Rev. 5.00, 09/03, page 369 of 760
CKIO
DRAK
Bus cycle
DREQ
DACK
(RD output)
CPU
CPU
DMAC(W)
DMAC(R)
DMAC(W)
DMAC(R)
CPU
High
High
High
High
3rd sampling is performed,
but since there is no
DREQ
falling edge,
per-cycle sampling starts
2nd sampling is performed,
but since there is no
DREQ
falling edge,
per-cycle sampling starts
1st sampling
2nd sampling
3
rd sampling
Note: When a
DREQ
falling edge is detected,
DREQ
must be high for at least one cycle before the sampling point.
Figure 11.19 Cycle-Steal Mode, Edge input (CPU Access: 2 Cycles)
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