Falling and rising trigger

e.g. F_Trig ('Expression')

The Falling trigger (F_Trig) function returns TRUE for a sample if a transition from TRUE to FALSE (falling edge) occurs in 'Expression'.

The Rising trigger (R_Trig) function returns TRUE for a sample if a transition from FALSE to TRUE (falling edge) occurs in 'Expression'.

Give at least the following arguments.

Function	Falling trigger or Rising trigger
Input (expression)	Signal or expression to which the function is to be applied