You don't have to construct a working circuit for control unit. But to get a solid understanding for

how the control unit works, you shall manually control the output from the control unit.

To the top of the Control unit, connect a $9$ bit input pin. Now you can use this input to manually

control the control unit.

Open up the control unit circuit:

NOTE: All output lines from the control unit but the ALUop are $1$ bits.

ALU: in a similar way as for the control unit, plug in a manual $4-$bit input pin for manual control of

the ALU control.

Fill in the following table. NOTE: some values don't need to be either $1$ or $0,$ you may use $x$ for

don't care.