Texas Instruments TMS320C64x DSP manual Capture DMA Event Generation Flow Diagram, Fifo ≥

DMA Operation

Figure 2–1. Capture DMA Event Generation Flow Diagram

Empty FIFO

Capture data, no

DMA pending

No

FIFO ≥ threshold

?

Yes

Generate DMA event

Capture data, DMA pend-
ing, new events disabled				No
	Pending DMA begun		No	FIFO overflow
		?		?
	Yes
Capture data, DMA active,
	new events enabled
				Yes
	FIFO ≥	2x threshold	No	No
				DMA complete
		?		?
	Yes
Generate DMA request
	Capture Data, DMA
active & DMA pending				No
Yes	DMA complete		No	Yes
				FIFO overflow
		?		?

Yes

Error

No

FIFO overflow

?

Yes

Overflow error

Overflow error

SPRU629 Video Port 2-7