The X marker in the Perm and Trans table columns indicates that the related safety mechanism is effective for
such fault model.
Table 151. List of safety recommendations
Diagnostic Description Rank Perm Trans
Arm
®
Cortex
®
-M4
CPU_SM_0
Periodic core self-test software for Arm
®
Cortex
®
-
M4 CPU.
++ X -
CPU_SM_1 Control flow monitoring in Application software ++ X X
CPU_SM_2 Double computation in Application software ++ - X
CPU_SM_3
Arm
®
Cortex
®
-M4 HardFault exceptions
M X X
CPU_SM_4 Stack hardening for Application software + X X
CPU_SM_5 External watchdog
++
(1)
X X
CPU_SM_6 Independent watchdog
++
(1)
X X
CPU_SM_7 Memory protection unit (MPU).
++
(2)
X X
CPU_SM_8 AMBA firewall + - -
MPU_SM_0 Periodic read-back of MPU configuration registers
++
(2)
X X
MPU_SM_1 MPU software test o X -
System bus architecture/BusMatrix
BUS_SM_0 Periodic software test for interconnections ++ X -
BUS_SM_1 Information redundancy in intra-chip data exchanges ++ X X
Embedded SRAM
RAM_SM_0
Periodic software test for static random access memory
(SRAM)
++ X -
RAM_SM_1 Parity on SRAM2 ++ X X
RAM_SM_2 Stack hardening for Application software + X X
RAM_SM_3
Information redundancy for safety-related variables in
Application software
++ X X
RAM_SM_4 Control flow monitoring in Application software
o
(3)
X X
RAM_SM_5 Periodic integrity test for Application software in RAM
o
(3)
X X
RAM_SM_6 Read protection (RDP) and write protection (WRP) + - -
Embedded Flash memory
FLASH_SM_0 Periodic software test for Flash memory + X -
FLASH_SM_1 Control flow monitoring in Application software ++ X X
FLASH_SM_2
Arm
®
Cortex
®
-M4 HardFault exceptions
M X X
FLASH_SM_3 Option byte write protection M - -
FLASH_SM_4 Static data encapsulation + X X
FLASH_SM_5 Option byte redundancy with load verification M X X
FLASH_SM_6 Flash memory unused area filling code + - -
FLASH_SM_7 ECC on Flash memory ++ X X
FLASH_SM_8
Read protection (RDP), write protection (WRP), and
proprietary code readout protection (PCROP)
+ - -
UM2305
Conditions of use
UM2305 - Rev 10
page 84/110
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