LM3S5G51 Datasheet, PDF (374/1266 Pages) Texas Instruments – Stellaris® LM3S5G51 Microcontroller

Micro Direct Memory Access (μDMA)
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
Unused
SRC
DST
ITEMS=16
Unused
SRC
DST
ITEMS=1
Unused
“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 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.
374
January 23, 2012
Texas Instruments-Production Data