This is 16 Bit ALU . Now explain this circuit to me step by step.. example- 1st here i used 1 bit ALU ,then i build 16 bit alu by connecting 16 one bit alu . now please explain me about this circuit in details.(step by step) . Actually I have to give a presentation about how this circuit is done . that's why i am asking for help. Thanks in advance . subject -computer organization and architecture. and please explain in easy way

Cin x1 x16 A X16 Birvert x1 Sbits Cout Select bits 00 01 = AND Gate =OR gate =Addition (A+B) =Subtraction(A-B) 10 11 B x16