STM32U375CE datasheet(15/222 Pages) STMICROELECTRONICS

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Table 7. Example of memory map security attribution versus SAU configuration regions

Region description Address range

IDAU security

attribution

SAU security attribution typical

configuration

Final security attribution

Code

external memories

0x0000 0000

0x07FF FFFF

Nonsecure

Secure or nonsecure or NSC (1)

Secure or nonsecure or

NSC

Code

flash and SRAM

0x0800 0000

0x0BFF FFFF

Nonsecure

0x0C00 0000

0x0FFF FFFF

NSC

Secure or NSC

Code

external memories

0x1000 0000

0x17FF FFFF

Nonsecure

0x1800 0000

0x1FFF FFFF

SRAM

0x2000 0000

0x2FFF FFFF

0x3000 0000

0x3FFF FFFF

NSC

Secure or NSC

Peripherals

0x4000 0000

0x4FFF FFFF

Nonsecure

0x5000 0000

0x5FFF FFFF

NSC

Secure or NSC

External memories

0x6000 0000

0xDFFF FFFF

Nonsecure

Secure or nonsecure or NSC

Secure or nonsecure or

NSC

1. NSC = nonsecure callable.

3.7.2

TrustZone®peripheral classification

When the TrustZone® security is active, a peripheral can be either securable or TrustZone®-aware type as

follows:

•

Securable: peripheral protected by an AHB/APB firewall gate that is controlled from TZSC to define

security properties

•

TrustZone®-aware: peripheral connected directly to AHB or APB bus and implementing a specific

TrustZone® behavior such as a subset of registers being secure

3.7.3

Default TrustZone® security state

The default system security state is detailed below:

•

CPU:

–

Cortex®-M33 is in a secure state after reset. The boot address must be in a secure address.

•

Memory map:

–

SAU is fully secure after reset. Consequently, all memory map is fully secure. Up to eight SAU

configurable regions are available for security attribution.

•

Flash memory:

–

Flash memory security area is defined by watermarking user options.

–

Flash memory block-based area is nonsecure after reset.

•

SRAMs:

–

All SRAMs are secure after reset. MPCBBx (memory protection block-based controllers) are secure.

STM32U375xx

Functional overview

DS14861 - Rev 2

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