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How do you do handshaking when turning off cores?

Question asked by David Chung Employee on Aug 18, 2016
Latest reply on Aug 19, 2016 by Martin Kovar

Hi Martin Kovar,

I am using the MPC5748G.  I want to program the z4a core to turn off z4b for DRUN mode.  So I cleared MC_ME_CCTL[DRUN] and then transition modes from DRUN to DRUN.  It can get stuck within mode transition if z4b is not ready to be turned off. The reference manual says the z4a would have to perform some sort of handshaking to make sure that the core to be turned off is ready to be turned off.  How would this handshaking be performed?  How would z4a communicate to z4b? What conditions must be met by z4b for it to be ready?  Thanks.