I am working on T1042's IFC Controller that is being driven by a flash. However, when i simulated my design i found that there is overshoot and undershoot at the data bus on the processor's (T1042) side. The undershoot and overshoot limit as defined by datasheet is 300mV. In my simulations, it is approaching 450mV. I want to know that for how much time period is this overshoot/undershoot acceptable? I searched the datasheet but could not find the required information.