synchronus reset with simple respected clock.it is required more no of gates,and it is didnt have metastabilty problem.it is working is slow. " [4 o! I/ m: X' H$ {3 e, ]0 ?9 i
1 l; r3 `/ X2 M0 D/ z. b8 ?asynchronous reset with out respected to the clock.it is required less no .of gates.it is suffer to the metastability problem.it is working is fast