Below is a simple four-bit ALU which has four function codes. Depending on the code, it can compute either bit-wise and, bit-wise or, bit-wise nand, or bit-wise nor of its two four-bit inputs, A and B.

For each of the operation codes, tell if the ALU computes and, or, nand, or nor.

f1 f0 function 0 0 ______ 0 1 ______ 1 0 ______ 1 1 ______

f1 and f0 are each pair of function codes below it.

TX function code TX xl WIEC TX OD B TX Xl Xl