Perturbations on altera cyclone IV e configuration signals

Hi,

My question is about the Nstatus and ConfDone signals behavior when Nconfig is submitted to perturbations:

Assuming we have a 10kohm pull-up with the 3V3 on Nconfig as suggested by Altera's documentation, and a short but high perturbation occurs forcing Nconfig to less than 1V during a few hundreds nanoseconds, how does an Altera Cyclone IV e react? During this short amount of time, will the Users I/O turn to High Z? is the FPGA going in reset state? How about Nstatus and Confdone signals?