# Why does the condition -(t_setup)<t_hold has to stand

I was given this inequality in logical circuits class and I can't figure out the reason behind it, and how can t_hold be negative. Is the condition relevant when t_hold is positive?

• If you have problem with negative values, just... rewrite it to its equivalent form. $-t_{setup}<t_{hold} \rightarrow t_{setup}>t_{hold}$ – Harry Svensson Sep 21 '18 at 14:25