LM3S2276 Datasheet, PDF (295/785 Pages) Texas Instruments – Stellaris® LM3S2276 Microcontroller

Figure 8-3. Memory Scatter-Gather, Setup and Configuration
1
Source and Destination
Buffer in Memory
2
Task List in Memory
Stellaris® LM3S2276 Microcontroller
3
Channel Control
Table in Memory
4 WORDS (SRC A)
A
16 WORDS (SRC B)
B
1 WORD (SRC C)
C
4 (DEST A)
16 (DEST B)
1 (DEST C)
SRC
DST
ITEMS=4
SRC
DST
ITEMS=16
SRC
DST
ITEMS=1
“TASK” A
“TASK” B
“TASK” C
SRC
DST
ITEMS=12
Channel Primary
Control Structure
SRC
DST
ITEMS=n
Channel Alternate
Control Structure
NOTES:
1. Application has a need to copy data items from three separate location in memory into one combined buffer.
2. Application sets up uDMA “task list” in memory, which contains the pointers and control configuration for three
uDMA copy “tasks.”
3. Application sets up the channel primary control structure to copy each task configuration, one at a time, to the
alternate control structure, where it will be executed by the uDMA controller.
November 17, 2011
295
Texas Instruments-Production Data