
372
CKIO
DRAK
Bus cycle
DREQ
DACK
(RD output)
CPU
CPU
DMAC(W)
DMAC(R)
DMAC(W)
DMAC(R)
CPU
3rd sampling is perf
or
med,
b
ut since
DREQ
is high,
per-cycle sampling star
ts
2nd sampling is perf
or
med,
b
ut since
DREQ
is high,
per-cycle sampling star
ts
1st sampling
2nd sampling
3rd sampling
Figure 11.18 Cycle-Steal Mode, Level input (CPU Access: 2 Cycles,
DREQ
Input Delayed)
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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