LM3S3748 Datasheet, PDF (200/753 Pages) List of Unclassifed Manufacturers – Microcontroller

Micro Direct Memory Access (μDMA)
Figure 9-5. Peripheral Scatter-Gather, Setup and Configuration
1
Source Buffer
in Memory
2
Task List 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
3
Channel Control
Table in Memory
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 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.
200
April 08, 2008
Preliminary