Rev. 2.00, 09/03, page 268 of 690
CKIO
Bus cycle
Bus cycle
DREQ
(Overrun 0 at high level)
DACK
(Active-high)
CPU
CPU
CPU
DMAC
CKIO
DREQ
(Overrun 1 at high level)
DACK
(Active-high)
CPU
CPU
CPU
DMAC
Non sensitive period
1st acceptance
2nd acceptance
Acceptance
start
Acceptance
start
1st acceptance
2nd acceptance
Non sensitive period
Figure 8.14 Example of DREQ Input Detection in Cycle Steal Mode Level Detection
CKIO
Bus cycle
DREQ
(Rising)
DACK
(Active-high)
CPU
CPU
DMAC
DMAC
Non sensitive period
Busrst acceptance
Figure 8.15 Example of DREQ Input Detection in Burst Mode Edge Detection
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