Prove a property when it is spent a time T?

Hello,

I have a model which represents a big system of the equations.

On this model I should prove a property (e.g. the output Yn = 0) when the input (e.g. Xk) has as value 1. Is it possible?

My problem contains two question:

1. Is it possible to give a set of signal builders to Design Verifier to prove a property?
2. Is it possible to enable Design Verifier to prove a property when an event occurs (in my case Xk =1)?

I hope to explain clearly my problem, thanks in advance for your replies

Andrea (I am a man :) )