STM32U595AI datasheet(29/377 Pages) STMICROELECTRONICS

29 / 377 page

DS13633 Rev 1

29/377

STM32U59xxx

Functional overview

Based on IDAU security attribution, the flash memory, system SRAM and peripheral

memory space is aliased twice for secure and nonsecure states. However, the external

memory space is not aliased.

The table below shows an example of typical SAU region configuration based on IDAU

regions. The user can split and choose the secure, nonsecure or NSC regions for external

memories as needed.

3.6.1

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

3.6.2

Default TrustZone security state

The default system security state is detailed below:

•

CPU:

Table 5. 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

Nonsecure

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.

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