  instr aluFunc selB selC wrReg wrMem
0 add     000    0     0    1     0
1 sub     001    0     0    1     0
2 xor     010    0     0    1     0
3 or      011    0     0    1     0
4 and     100    0     0    1     0
8 addi    000    1     0    1     0
9 lw      000    1     1    1     0
a sw      000    1     X    0     1
