DT-DMA Mechanism
7-18
- The DT-DMA mechanism does not cause a program-flow discontinuity. No
interrupt-like save/restore is performed. When a preemptive DT-DMA forces
a hole, no program address counters increment during that cycle.
- A DT-DMA request awakens the device from the idle state (initiated by the
IDLE instruction). However, unlike returning from an interrupt, the CPU re-
turns to the idle state upon completion of the DT-DMA.
Note:
The information shown on the debugger screen is gathered at different times
from the target; therefore, it does not represent a snapshot of the target
state, but rather a composite. It also takes the host time to process and dis-
play the data. The data does not correspond to the current target state, but
rather, the target state as of a few milliseconds ago.
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