Final answer:
The ALU control signals required for subtraction include setting the carry-in to 1, setting the appropriate opcode, and activating the subtraction control signal.
Step-by-step explanation:
The ALU (Arithmetic Logic Unit) control signals required to output a subtraction operation depend on the design of the specific ALU. However, in a typical ALU, the control signals for subtraction would include:
- Set the carry-in to 1
- Set the operation code (opcode) to indicate subtraction (e.g., in a 4-bit ALU, opcode=0010)
- Activate the subtraction control signal
These control signals would enable the ALU to perform the subtraction operation.