Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 234

External Port DMA
SOURCE BUFFER
20
19
18
17
Figure 3-22. Circular Buffering Write DMA
DESTINATION BUFFER
20
19
18
17
3
2
1
Figure 3-23. Circular Buffering Read DMA
Chained DMA Mode
Chained DMA is used to support repetitive reads and writes to a specific
area which is defined by the individual TCBs.
Changing DMA Direction on the Fly
The SHARC processors allow a change of external port data direction for
each individual TCB in a chain sequence.
3-104
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DESTINATION BASE
ADDRESS (EBEP)
DESTINATION INDEX
(IIEP)
3
2
SOURCE INDEX
1 (IIEP)
SOURCE INDEX
(EIEP)
SOURCE BASE
ADDRESS (EBEP)
DESTINATION INDEX
(IIEP)
ADSP-214xx SHARC Processor Hardware Reference
DESTINATION BUFFER
19
20
1
2
BUFFER LENGTH
16
17
18
SOURCE BUFFER
19
20
1
2
BUFFER LENGTH
(ELEP)
16
17
18
(ELEP)