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Power Management for AM3894

Takasugi Hirokazu
Expert 3540 points

Hello,

How do we get power management?  TRM (SPRUGX7) described about MPU in Table1-8, MPU Power States and Table 1-9. MPU Subsystem Operation Power Modes. But does not described control registers.  Customer want to know these information.

Thank you
regards
Takasugi

 

 

  • 0
    TI__Mastermind 25055 points

    Hello,

    Have they looked at the Registers section of the PRCM chapter of the device TRM?

    Regards,
    Marc

  • 0 in reply to MarcPyne
    TI__Expert 3540 points

    Hello Marc,

    Thank you for your reply.

    > Have they looked at the Registers section of the PRCM chapter of the device TRM?
    Yes, we are understanding these tables with PRCM chapter.  The customer want to set Stand-by mode when the system is no operation to reduce power consumption.
    where do we refer the section?

    And more questions
          1.  Table1-8 in TRM, The Logic Power, Memory Power and Clocks supports Active mode, Inactive mode, and OFF mode.  Is my understanding correct?
          2.  Table1-9 in TRM, this table is described RET and OFF state, but does not setting registers. Which do we refer registers?
          3.  CM_CLKSTCTRL_MPU, CM_CLKSTCTRL_NEON is described section "1.2.10.3 NEON Power Mode Transition", but does not exist section 18.7 registers. Is it typo?
          4.  Which combination (inactive or OFF) is the lowest power consumption in MPU module for stand-by mode? 

    Thank you
    Regards
    Takasugi

  • 0 in reply to Takasugi Hirokazu
    TI__Mastermind 25055 points

    Hello,

    We've got some answers for you now:

    1. The Table is wrong.  Only Active mode is supported; MPU belongs to the AlwaysOn Power Domain and is always powered.

    2. The Table is wrong.  RET and OFF are not supported; MPU belongs to the AlwaysOn Power Domain and doesn't support RET/OFF.

    3. These Registers don't exist. Refer to the register CM_ALWON_MPU_CLKCTRL. 

    4. Putting the MPU in WFI state has the lowest power consumption for the MPU.  Wait for Interrupt (WFI) is the idle state for Cortex-A8.

    Sorry for any confusion; we will correct the mistakes in the TRM.

    Regards,
    Marc