Answer the following questions based on the schematic below.

1. Suppose you need to write the ALU result to register 0. What signal(s) control this and what do their values need to be?
2. What two purposes does the control signal R_destination serve? What might be an advantage of sharing the control signal for two purposes? A disadvantage?
3. What effect does having more registers have in the size of the processor's machine code?

ALU Register File R_destination(1:0) - R_addr_a R_data_a R_source(1:0) - R_addr_b R_data_b Output_A[7:0] Output_B[7:0] a F 0 1 W_data W_addr W_enable R_destination(1:0) - '1' b Input[7:0) use_input Opcode(2:0)