AnsweredAssumed Answered

iMX7D A7 and M4 both in STOP mode not working

Question asked by Kunjal Garach on Nov 25, 2016
Latest reply on Nov 29, 2016 by CarlosCasillas

I am working on iMX7D Soc power management. My product is battery operated and require efficient power management.


Let's say, initially I keep both - A7 and M4 is in RUN mode. M4 side i configured external interrupt as wake up source.  

Keeping A7 operating in RUN mode, I put M4 core in STOP mode to observe the effect.

I have observed that putting M4 in STOP mode also puts A7 in STOP mode automatically.

If I give external interrupt trigger to M4, it will pull M4 out of STOP mode. In interrupt handler routine if I make M4 to RUN mode then A7 also start responding.


Why I am observing this type of behavior? 

Why putting M4 in STOP mode, A7 stops responding?