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RM0453 Rev 5 485/1450

RM0453 DMA request multiplexer (DMAMUX)

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14.4.2 DMAMUX signals

Table 86 lists the DMAMUX signals.

14.4.3 DMAMUX channels

A DMAMUX channel is a request multiplexer channel that can include, depending upon the

selected input of the request multiplexer, an additional DMAMUX request generator

channel.

A DMAMUX request multiplexer channel is connected and dedicated to a single channel of

DMA controller(s).

Channel configuration procedure

Follow the sequence below to configure a DMAMUX x channel and the related DMA

channel y:

1. Set to secure or non-secure the DMA channel y by a secure write access to the secure

control bit of the DMA channel y configuration register, and set to privileged or

unprivileged the DMA channel y by a privileged write access to the privileged control bit

of the DMA channel y configuration register.

2. Set and configure completely the DMA channel y, except enabling the channel y.

3. Set and configure completely the related DMAMUX y channel.

4. Last, activate the DMA channel y by setting the EN bit in the DMA y channel register.

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.

Table 86. 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)

dma_secmx Secure mode of each DMA controller request channel

dma_privx Privileged mode of each DMA controller request channel

dmamux_evtx DMAMUX events outputs

dmamux_non_sec_ovr_it DMAMUX non-secure overrun interrupts

dmamux_sec_ovr_it DMAMUX secure overrun interrupts

dmamux_illegal_access_it DMAMUX security illegal access output (to secure interrupt controller)

STMicroelectronics STM32WL5 Series User Manual

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