What are the detailed "startup" conditions for the module to leave reset & begin running?...By this, I mean I know applying +3.3V (along with some other voltages) starts it running. Is there some threshold it first crosses, then it waits xx ms before running? Is there something holding it in reset until a certain condition is reached, then reset is released and the show begins? Are there any adjustments available to these parameters? After software shutdown my unit seems to be trying to restart (don't want that), but I'm not sure what the trigger mechanism is. Ten secs after software shutdown the supply voltage is falling (since it gets shut off seconds later)
Quote from page 17 of the Compute manual data sheet:
7.1 Supply Sequencing
Supplies should be staggered so that the highest voltage comes up first, then the remaining voltages
in descending order. This is to avoid forward biasing internal (on-chip) diodes between supplies, and
causing latch-up. Alternatively supplies can be synchronised to come up at exactly the same time as
long as at no point a lower voltage supply rail voltage exceeds a higher voltage supply rail voltage.
Is this condition achieved by your design? Are you using RUN signal?
How do you see 'your unit tries to restart'?