Section 4.4 does not discuss I-type instructions like ADDI or ANDI.

a) What additional logic blocks, if any, are needed to add I-type instructions to the CPU shown in Figure below? Add any necessary logic blocks to Figure below and explain their purpose.

b) List the values of the signals generated by the control unit for ADDI. Explain the reasoning for any dont care control signals.

Add Shift Reg2Loc Uncondbrancheft 2 MemRead MemioReg nsbtucfion 31-211 Cantrol nstrudtion 9-6 Read Read PC address Zero Instructon 31-0 ngister 2 Read Whrite Read Instruction | Instudn 4-0 memory |data Registers Write Data data memory ? Sign- xtend nstruction 31-32 ALU control Intruction 31-21 Add Shift Reg2Loc Uncondbrancheft 2 MemRead MemioReg nsbtucfion 31-211 Cantrol nstrudtion 9-6 Read Read PC address Zero Instructon 31-0 ngister 2 Read Whrite Read Instruction | Instudn 4-0 memory |data Registers Write Data data memory ? Sign- xtend nstruction 31-32 ALU control Intruction 31-21