Hardware reset for WP76xx

I want to reset the WP76xx chip, the document states that we have to pull down both POWER_ON_N and RESET_IN_N together to reset.
When does POWER_ON_N need to be pulled down? Can it be done before RESET_IN_N is pulled down, at the same time as RESET_IN_N or after?
Since the document isn’t clear on when POWER_ON_N should be pulled down

Have you tried to put POWER_ON_N to low level throughout your test?