STM32L552CC_V01 datasheet(56/340 Pages) STMICROELECTRONICS

56 / 340 page

Functional overview

STM32L552xx

56/340

DS12737 Rev 6

3.16

DMA request router (DMAMUX)

When a peripheral indicates a request for DMA transfer by setting its DMA request line, the

DMA request is pending until it is served and the corresponding DMA request line is reset.

The DMA request router allows to route the DMA control lines between the peripherals and

the DMA controllers of the product.

An embedded multi-channel DMA request generator can be considered as one of such

peripherals. The routing function is ensured by a multi-channel DMA request line

multiplexer. Each channel selects a unique set of DMA control lines, unconditionally or

synchronously with events on synchronization inputs.

DMAMUX main features

•

16-channel programmable DMA request line multiplexer output

•

4-channel DMA request generator

•

23 trigger inputs to DMA request generator

•

23 synchronization inputs

•

Per DMA request generator channel:

–

DMA request trigger input selector

–

DMA request counter

–

Event overrun flag for selected DMA request trigger input

•

Per DMA request line multiplexer channel output:

–

90 input DMA request lines from peripherals

–

One DMA request line output

–

Synchronization input selector

–

DMA request counter

–

Event overrun flag for selected synchronization input

–

One event output, for DMA request chaining

•

TrustZone support:

–

Support for AHB secure and non-secure DMA transfers, independently at a

channel level.

–

TrustZone-aware AHB slave port, protecting any secure resource (register,

event.

–

Two secure and non-secure interrupt requests, resulting from any of the

respectively secure and non-secure channels. Each channel event being caused

from any of the two DMAMUX input events: trigger or synchronization overrun,

associated with a respectively secure and non-secure channels.

•

Privileged / Unprivileged support:

–

Support for AHB privileged and unprivileged DMA transfers, independently, at a

channel level.

–

Privileged-aware AHB slave port.

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