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Chapter 17 eDMA Channel Multiplexer (DMA_MUX)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
301
NOTE
Because of the dynamic nature of the system (such as eDMA channel
priorities, bus arbitration, or interrupt service routine lengths), the number
of clock cycles between a trigger and the actual eDMA transfer cannot be
guaranteed.
Figure 17-3. DMA_MUX channel 0–3 block diagram
The eDMA channel triggering capability allows the system to schedule regular eDMA 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 eDMA until a trigger event has been seen. This is illustrated
in
Figure 17-4. DMA_MUX channel triggering: Normal operation
DMA Channel #0
Trigger #4
Trigger #2
Trigger #1
Source #1
Source #2
Source #3
Source #28
Always enabled
Always enabled
DMA Channel #3
Periph Request
Trigger
DMA Request
Содержание MPC5605BK
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