The trigger is generated by the periodic interrupt timer (LPIT); as such, the configuration
of the periodic triggering interval is done via configuration registers in the LPIT. See the
section on periodic interrupt timer for more information on this topic.
Note
Because of the dynamic nature of the system (due to DMA
channel priorities, bus arbitration, interrupt service routine
lengths, etc.), the number of clock cycles between a trigger and
the actual DMA transfer cannot be guaranteed.
DMA channel #0
Source #1
Source #2
Source #3
Always #1
DMA channel #m-1
Always #y
Trigger #m
Source #x
Trigger #1
Figure 11-2. DMAMUX triggered channels
The DMA channel triggering capability allows the system to schedule regular DMA
transfers, usually on the transmit side of certain peripherals, without the intervention of
the processor. This trigger works by gating the request from the peripheral to the DMA
until a trigger event has been seen. This is illustrated in the following figure.
Functional description
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