DMA request multiplexer (DMAMUX) RM0440
430/2126 RM0440 Rev 4
13.4.2 DMAMUX signals
Table 94 lists the DMAMUX signals.
13.4.3 DMAMUX channels
A DMAMUX channel is a DMAMUX request multiplexer channel that may include,
depending on the selected input of the request multiplexer, an additional DMAMUX request
generator channel.
A DMAMUX request multiplexer channel is connected and dedicated to one single channel
of DMA controller(s).
Channel configuration procedure
Follow the sequence below to configure both a DMAMUX x channel and the related DMA
channel y:
1. Set and configure completely the DMA channel y, except enabling the channel y.
2. Set and configure completely the related DMAMUX y channel.
3. Last, activate the DMA channel y by setting the EN bit in the DMA y channel register.
13.4.4 DMAMUX request line multiplexer
The DMAMUX request multiplexer with its multiple channels ensures the actual routing of
DMA request/acknowledge control signals, named DMA request lines.
Each DMA request line is connected in parallel to all the channels of the DMAMUX request
line multiplexer.
A DMA request is sourced either from the peripherals or from the DMAMUX request
generator.
The DMAMUX request line multiplexer channel x selects the DMA request line number as
configured by the DMAREQ_ID field in the DMAMUX_CxCR register.
Note: The null value in the field DMAREQ_ID corresponds to no DMA request line selected.
Table 94. DMAMUX signals
Signal name Description
dmamux_hclk DMAMUX AHB clock
dmamux_req_inx DMAMUX DMA request line inputs from peripherals
dmamux_trgx DMAMUX DMA request triggers inputs (to request generator sub-block)
dmamux_req_genx DMAMUX request generator sub-block channels outputs
dmamux_reqx
DMAMUX request multiplexer sub-block inputs (from peripheral
requests and request generator channels)
dmamux_syncx DMAMUX synchronization inputs (to request multiplexer sub-block)
dmamux_req_outx DMAMUX requests outputs (to DMA controllers)
dmamux_evtx DMAMUX events outputs
dmamux_ovr_it DMAMUX overrun interrupts
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