Examine the difficulty of adding a proposed ss Rd, Rn, #immediate (Store sum) instruction to the LEGv8 instruction set, which works as follows: Mem[Reg[Rd]]=Reg[Rn]+immediate. (20pts)

Figure 4.23

a. Which new functional blocks (if any) do we need for this instruction? (4 pts)

b. Which existing functional blocks (if any) require modification? (4 pts)

c. What new datapaths do we need (if any) to support this instruction? (4 pts)

d. What new control unit signals (if any) do we need for this instruction? (4 pts)

e. Modify the complete control and datapath Figure to demonstrate the implementation of this new instruction. Use Figure 4.23, also shown in Chapter 4 slides, Slide 25. (4 pts)

Add Add resu Reg2Loc Shift insruction (B1-211 Control MemRead Memto RegWhnte Instruction 19-5 Read stuction (20-161r Read Read data1 Write Read PCaddress Zero | Instruction 31-0 xregister 2 ALU ALU-Address 'ata data Instruction Instruction 14-0 Wite Data data me data Registers 32 Signcontrol gn-64 extend Instruction [31-0 ALU Instruction 131-21 Add Add resu Reg2Loc Shift insruction (B1-211 Control MemRead Memto RegWhnte Instruction 19-5 Read stuction (20-161r Read Read data1 Write Read PCaddress Zero | Instruction 31-0 xregister 2 ALU ALU-Address 'ata data Instruction Instruction 14-0 Wite Data data me data Registers 32 Signcontrol gn-64 extend Instruction [31-0 ALU Instruction 131-21