LM3S5652 Luminary Micro, Inc, LM3S5652 Datasheet - Page 186

• Manufacturer Part Number: LM3S5652
• Description: Lm3s5652 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Micro Direct Memory Access (μDMA)
Figure 9-2. Example of Ping-Pong DMA Transaction
9.2.6.5
186
Alternate Structure
Alternate Structure
Primary Structure
Primary Structure
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
June 02, 2008