Question

In a gated S-R latch, what values of G, S and R produce Q = 1?

		G = 0, S = 1, R = 0
		G = 1, S = 1, R = 1
		G = 0, S = 0, R = 1
		G = 1, S = 0, R = 1
		none of these

Answer 1

For how SR latch works refer SR latch.

  S -> set output to '1'

  R -> reset output to '0'

  Q(t)   -> present state.

  Q(t+1) -> next state.

  Latch is always level triggered.

  When Clock(here is G)='0' , R' and S' is 0 .So, No change in the output occurs.

  When Clock='1' , R and S inputs are propagated and its a basic SR latch

operation.

So, you can verify for Q=1 , we should have Clock(G) is 1 and S=1, R=0

So the correct option is NONE OF THE ABOVE.