STMicroelectronics STM32WL5 Series User Manual

RM0453 Rev 5 69/1450
RM0453 Memory and bus architecture
70
This example show only a secure and privileged protected memory map. The security and
unprivileged parameters can freely be programmed in any order as detailed below:
• When HDPSA > SFSA> unprivileged watermark > unprivileged write watermark, the
areas appear in the following order:
– Secure privileged hide protection area at the top
– Secure privileged area
– Non-secure privileged area
– Non-secure unprivileged read only area
– Non-secure unprivileged area starting from the memory base address.
• unprivileged write watermark >= unprivileged watermark, the areas appear in the
following order:
– privileged area at the top
– Unprivileged area starting from the memory base address (no unprivileged read
only area in this case)
Memory access protection overview
The secure area of the memories have exclusively read, write, execute access only from the
secure CPU2 and secure DMA channels. CPU1 and non-secure DMA channels have no
execute, read, nor write access to these areas.
The non-secure area of the memories grants full read, write, execute access to CPU1 and
all DMA channels. CPU2 has only read and write access to the non-secure areas. CPU2 is
prevented from executing from non-secure areas.
Access rules from the different bus masters and secure, non-secure, privileged and
unprivileged access types to the different memory areas is given in the table below.
Table 3. Memory security and privilege access
SoC level memory area
CPU2 hide
protection
privileged
CPU2
privileged
CPU2
unprivilege
d
CPU1
privileged
CPU1
unprivilege
d
DMA
ch sub-lv
secure priv
DMA
ch sub-lv
secure
DMA
ch sub-lv
non-secure
DMA
ch sub-lv
Non-secure
Flash memory
Hide protection secure
privileged
ex, rd,
wr
no
access
(1)
no
access
(2)
no
access
(2)
no
access
(2)
(rd, wr)
(1)
no
access
(2)
no
access
(2)
no
access
(2)
Secure privileged
ex, rd,
wr
rd, wr
Secure privileged
Unprivileged execution
ex, rd
(3)
rd
Secure unprivileged
ex, rd,
wr
rd, wr
Non-secure privileged
rd, wr rd, wr
no
access
(2)(4)
ex, rd,
wr
no
access
(2)(4)
rd, wr
Non-secure unprivileged rd, wr
ex, rd,
wr
rd, wr rd, wr

STMicroelectronics STM32WL5 Series Specifications

General

Brand	STMicroelectronics
Model	STM32WL5 Series
Category	Microcontrollers
Language	English