3a4,5
>      180001 ps:	a=0 b=0 e=0 f=1 -> sig1=1 sig2=0 -> y=1
>      224001 ps:	a=0 b=0 e=0 f=1 -> sig1=0 sig2=0 -> y=0
5a8
>      400001 ps:	a=0 b=0 e=1 f=1 -> sig1=1 sig2=1 -> y=0
9a13
>      610001 ps:	a=0 b=0 e=1 f=1 -> sig1=1 sig2=1 -> y=0
