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RM57L843: RM57L843

user5090366
Prodigy 100 points
Part Number: RM57L843

When nmpu of EMAC is in diagnostic mode, can DMA of EMAC work normally?

  • 0
    TI__Guru**** 186196 points

    Hello,

    There are 2 different diagnostic modes: internal diagnostic mode and external diagnostic mode.

    In internal diagnostic mode, the diagnostic logic drives the input of the MPU comparator logic. NMPU does not accept any access originated from the bus master. 

    In external diagnostic mode, the actual bus master initiates the access to the NMPU. 

    Both diagnostic modes require user to ensure that no bus transactions from the master are going on while NMPU is in diagnostic mode by disabling bus master access.

  • 0 in reply to QJ Wang
    Prodigy 100 points
    When the NMPU is in diagnostic mode, how to deal with the incoming data? If it will cause packet loss, when DMA of EMAC is disabled during diagnostic mode?
  • 0 in reply to user5090366
    TI__Guru**** 186196 points
    Diagnostic mode can be used to verify the MPU address and access permission comparator logic working properly at either start up time or during application run time with/without error encountered. Memory protection must be disabled while entering or exiting diagnostic mode. Without protection doesn't mean you loss data during data transfer between SRAM and EMAC with DMA.