STM32L552CCT3PTR datasheet(27/340 Pages) STMICROELECTRONICS

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DS12737 Rev 6

27/340

STM32L552xx

Functional overview

3.8

TrustZone security architecture

The security architecture is based on Arm® TrustZone® with the Armv8-M Main Extension.

The TrustZone security is activated by the TZEN option bit in the FLASH_OPTR register.

When the TrustZone is enabled, the SAU (security attribution unit) and IDAU

(implementation defined attribution unit) defines the access permissions based on secure

and non-secure state.

•

SAU: Up to 8 SAU configurable regions are available for security attribution.

•

IDAU: It provides a first memory partition as non-secure or non-secure callable

attributes. It is then combined with the results from the SAU security attribution and the

higher security state is selected.

Based on IDAU security attribution, the Flash, system SRAMs and peripherals memory

space is aliased twice for secure and non-secure state. However, the external memories

space is not aliased.

Table 6 shows an example of typical SAU regions configuration based on IDAU regions.

The user can split and choose the secure, non-secure or NSC regions for external

memories as needed.

Table 6. Example of memory map security attribution vs SAU configuration regions(1) (2)

Region

description

Address range

IDAU security

attribution

SAU security

attribution typical

configuration

Final security

attribution

Code - external

memories

0x0000_0000

0x07FF_FFFF

Non-secure

Secure or non-

secure or NSC

Secure or non-

secure or NSC

Code - Flash and

SRAM

0x0800_0000

0x0BFF_FFFF

Non-secure

0x0C00_0000

0x0FFF_FFFF

NSC

Secure or NSC

Code - external

memories

0x1000_0000

0x17FF_FFFF

Non-secure

0x1800_0000

0x1FFF_FFFF

SRAM

0x2000_0000

0x2FFF_FFFF

Non-secure

0x3000_0000

0x3FFF_FFFF

NSC

Secure or NSC

Peripherals

0x4000_0000

0x4FFF_FFFF

Non-secure

0x5000_0000

0x5FFF_FFFF

NSC

Secure or NSC

External memories

0x6000_0000

0xDFFF_FFFF

Non-secure

Secure or non-

secure or NSC

Secure or non-

secure or NSC

1. NSC = non-secure callable.

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