Figure 9-5. Peripheral Scatter-Gather, Setup and Configuration
C
4 WORDS (SRC A)
16 WORDS (SRC B)
1 WORD (SRC C)
A
B
SRC
DST
ITEMS=12
SRC
DST
ITEMS=n
Task List in Memory
21 3
Source Buffer
in Memory
Channel Control
Table in Memory
Channel Primary
Control Structure
Channel Alternate
Control Structure
DEST
Peripheral Data
Register
SRC
DST
ITEMS=16
Unused
SRC
DST
ITEMS=1
DST
“TASK” A
“TASK” B
“TASK” C
Unused
ITEMS=4
SRC
Unused
NOTES:
1. Application has a need to copy data items from three separate locations in memory into a peripheral data
register.
2. Application sets up µDMA “task list” in memory, which contains the pointers and control configuration for three
µDMA 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 is executed by the µDMA controller.
691June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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