LM3S3749 Datasheet, PDF (311/898 Pages) Texas Instruments – Stellaris® LM3S3749 Microcontroller

Stellaris® LM3S3749 Microcontroller
Figure 8-5. Peripheral Scatter-Gather, Setup and Configuration
1
Source Buffer
in Memory
2
Task List in Memory
3
Channel Control
Table in Memory
4 WORDS (SRC A)
A
16 WORDS (SRC B)
B
1 WORD (SRC C)
C
Peripheral Data
Register
DEST
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 a peripheral data
register.
2. Application sets up μDMA “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 μDMA controller.
November 17, 2011
311
Texas Instruments-Production Data