User's Manual

DMA Operation
2-7Video PortSPRU629
Figure 2–1. Capture DMA Event Generation Flow Diagram
Error
Overflow error
Yes
Overflow error
FIFO overflow
?
No
Yes
Yes
Capture data, DMA active,
new events enabled
No
FIFO overflow
?
DMA complete
?
Capture Data, DMA
active & DMA pending
DMA complete
?
No
Generate DMA request
FIFO ≥ 2x threshold
?
Yes
No
Yes
No
No
FIFO ≥ threshold
?
No
No
Capture data, DMA pend-
ing, new events disabled
Pending DMA begun
?
Yes
Generate DMA event
Yes
FIFO overflow
?
Yes
Capture data, no
DMA pending
Empty FIFO