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Original question:

AM6442: How to conduct mmu functional safety diagnosis

AM2434: Functional Safety considerations when using shared Memory between R5F and M4F

awolde
Prodigy 60 points
Part Number: AM2434

When using the

  • AM2434 R5F for a non safety application and
  • the isolatored core M4F for a functional safety application and
  • R5F and M4F share system memory (DDR4 RAM) during runtime:

1. What functional safety and diagnostic feature must be enabled to avoid  interference from the non safe R5F with the safe M4F?

2. Is using the MPU enough?

2. Do you have any application notes regarding this topic?

  • 0
    TI__Expert 6880 points

    1. Firewalls can be used to restrict memory regions access in  DDR  and peripheral access by R5F and M4F.
    2. Reset isolation can isolate the MCU channel with M4F from the rest of the device. Timeout gaskets are enabled with such isolation that will prevent hangs from main domain to propagate to MCU domain. With such isolation, main domain can be reset without having to reset the MCU domain.

    Neelima