TM4C123BE6PZ Datasheet, PDF (583/1299 Pages) Texas Instruments – This data sheet provides reference information for the TM4C123BE6PZ microcontroller, describing

Tiva^™ TM4C123BE6PZ Microcontroller _{(identical to LM4F212E5QC)}
Figure 9-2. Example of Ping-Pong μDMA Transaction
µDMA Controller
Primary Structure
SOURCE
DEST
CONTROL
Unused
transfers using BUFFER A
BUFFER A
Peripheral/_{µDMA Interrupt}
Alternate Structure
SOURCE
DEST
CONTROL
Unused
transfers using BUFFER B
BUFFER B
Peripheral/_{µDMA Interrupt}
Primary Structure
SOURCE
DEST
CONTROL
Unused
transfers using BUFFER A
BUFFER A
Peripheral/_{µDMA Interrupt}
Alternate Structure
SOURCE
DEST
CONTROL
Unused
transfers using BUFFER B
BUFFER B
Cortex-M4F 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
9.2.6.5
Memory Scatter-Gather
Memory Scatter-Gather mode is a complex mode used when data must be transferred to or from
varied locations in memory instead of a set of contiguous locations in a memory buffer. For example,
a gather μDMA 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.
July 17, 2013
583
Texas Instruments-Production Data