000000[5:0] = - 000[2:0]
111111[5:0] = - 001[2:0]
111110[5:0] = - 010[2:0]
111101[5:0] = - 011[2:0]
111100[5:0] = - 100[2:0]
111011[5:0] = - 101[2:0]
111010[5:0] = - 110[2:0]
111001[5:0] = - 111[2:0]