i have 4 signals and i want to turn my signal green when input comes , but at atime i want only one signal 2 b green . i-e if an input comes turn its signal green and jam or disable rest of other sensors so if an input comes on sensos it is not effected. in other words one enabled rest of others disabled . when firsst one stops giving input all sensors are activated. and how 2 pause my clock i-e it should remains in its previous state? may b flip flops r used? i am studying the course of DLD gates .....

 

I think you could use flip-flops.