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RM0453 Rev 2 487/1454

RM0453 DMA request multiplexer (DMAMUX)

497

Figure 51. Synchronization mode of the DMAMUX request line multiplexer channel

Figure 52. Event generation of the DMA request line multiplexer channel

If EGE is enabled, the multiplexer channel generates a channel event, as a pulse of one

AHB clock cycle, when its DMA request counter is automatically reloaded with the value of

the programmed NBREQ field, as shown in Figure 51 and Figure 52.

MSv41974V1

Selected DMA request line transferred to the output

DMA request counter

dmamux_evtx

dmamux_req_outx

dmamux_syncx

Selected

dmamux_reqx

Synchronization event

Input DMA request line connected to output

321 044

DMA request counter underrun

DMA request counter auto-reload to NBREQ

Input DMA request line disconnected from output

Example: DMAMUX_CCRx configured with: NBREQ=4, SE=1, EGE=1, SPOL=01 (rising edge)

Not pending

DMA request pending

DMA requests served

MSv41975V1

DMA request counter

dmamux_evtx

DMA request counter reaches zero

Event is generated on the output

DMA request counter auto-reloads with NBREQ value

Example with: DMAMUX_CCRx configured with: NBREQ=3, SE=0, EGE=1

1 0 3 2 1 0 3 2 1 0

EGE