LM3S5632 Luminary Micro, Inc, LM3S5632 Datasheet - Page 183
LM3S5632
Manufacturer Part Number
LM3S5632
Description
Lm3s5632 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S5632.pdf
(685 pages)
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Figure 9-2. Example of Ping-Pong DMA Transaction
9.2.6.5
June 02, 2008
Alternate Structure
Alternate Structure
Primary Structure
Primary Structure
Refer to Figure 9-2 on page 183 for an example showing operation in Ping-Pong mode.
Memory Scatter-Gather
Memory Scatter-Gather mode is a complex mode used when data needs to be transferred to or
from varied locations in memory instead of a set of contiguous locations in a memory buffer. For
example, a gather DMA operation could be used to selectively read the payload of several stored
packets of a communication protocol, and store them together in sequence in a memory buffer.
uDMA Controller
SOURCE
SOURCE
SOURCE
SOURCE
DEST
DEST
DEST
DEST
transfers using BUFFER B
transfers using BUFFER B
transfers using BUFFER A
transfers using BUFFER A
Preliminary
BUFFER A
BUFFER B
BUFFER A
BUFFER B
Cortex-M3 Processor
Process data in BUFFER A
Reload primary structure
Process data in BUFFER B
Reload alternate structure
Process data in BUFFER B
Reload alternate structure
LM3S5632 Microcontroller
183
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