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Figure 7.18 shows the timing when the DMAC is activated by the falling edge of DREQ in block
transfer mode.
T
1
φ
DREQ
Address
bus
RD
HWR
LWR
,
TEND
Figure 7.18 Timing of DMAC Activation by Falling Edge of DREQ in Block Transfer Mode
DMAC cycle
T
T
T
T
T
2
1
2
1
End of 1 block transfer
CPU cycle
T
T
T
T
2
1
2
1
2
Next sampling
Minimum 4 states
DMAC cycle
T
T
T
T
T
1
2
d
1
2
229
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