My chip’s CPU is running on 225MHz, other peripherals like OTP and debug modules is running on 112.5MHz.
Say I want to use voltage glitching to bypass steps, since voltage glitching works on the entire system, is it impossible to glitch on lower clocked modules because higher clocked CPU would crash before the glitch on lower clocked module is successful?
It’s impossible to answer this in the general sense.
Keep in mind that with scope.glitch.output = 'glitch_only', you can issue glitches that are much narrower than a clock cycle.
With clock frequency doubled, the glitch duration in term on percentage of a single instrument is doubled comparing to slower clock module. Assuming glitch duration is fix and only glitch voltage decrease with each trail, the success/crash condition for faster clock module will be reached first?
Unfortunately it’s impossible to answer this; you have to try and see.
Stating the obvious: the outcome will depend on what the different parts of the target are doing when the glitch hits.