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kicker mechanism question (c6678)

I'm trying to understand how to use the Kicker mechanism.

When i write the correct code to Kick0 and kick1 for unlock the registers, can i write to the protected registers only for 1 write or for unlimited time until i write a different code to kick0 and kick1?

It's possibile to lock and unlock the registers for an unlimited number of times or if i lock them, they are locked until next hardware reset?

And what registers are protected by that mechanism?
i've found that the PLL registers are protected, but the datasheet refers to the "Bootcfg registers" and i cant found what registers are... 
are perhaps the registers "Chip level Registers"? 

  • Description for the KICK register mechanism is described in section 3.3.4 of the C6678 Data manual .

    Once the Kick registers are unlocked, you can write any number of times to the boot cfg MMRs until you write the lock code into the Kick registers. You can lock and unlock the Kick registers any number of times.

    The Kick register protect the device State control registers specified in section 3.3 and table 3-2.

    Regards,

    Rahul