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TMS320F28P659DK-Q1: Lockstep function is optional

Wayne Huang
Genius 16805 points

Part Number: TMS320F28P659DK-Q1

Dear champ,

I am asking this for our customer.

Would you please confirm lockstep function is optional?

That is, if the user wants to use 3 cores (CPU1/CLA1/CPU2) for different purposes at the same time, the user can just disable lockstep by LSEN register in initialization codes to unleash all computational power of the three cores.

Is it correct?

  • 0
    TI__Genius 15676 points

    Hello Wayne,
    In f28p65x devices we have lockstep only for CPU2,CPU.DMA,CPU2.PIE not for CPU1.

    See the diagram below where there is a shadow CPU2 for lockstep
    If the lockstep is disabled that means the CPU2 is available for use irrespective for LCM enabled or not.
    Its just that you would run CPU2 with lockstep and that shadow CPU2 is not available otherwise which can be understood from diagram below

    Thanks,
    Prarthan

  • 0 in reply to Prarthan Bhatt
    TI__Genius 16805 points

    Dear Prathan,

    It means no matter LCM is enabled or disabled, on these devices with CPU1/CPU2/CLA1 and lockstep configuration like F28P659DK9, DH8, the use can always use CPU2 independently.

    When we disabled LCM, it just save power consumption.

    Is my understanding correct?

  • +1 in reply to Wayne Huang
    TI__Genius 15676 points

    Yes CPU2 is always available be used irrespective of lockstep enabled or not
    There is a shadow cpu2 which is in lockstep with cpu2.


    Thanks,
    Prarthan