Question

Question 5 0.25 pts What is the value of the MemWrite control signal? Question 6 0.25 pts What is the value of the ALUSrc control signal? Add Add Sum--(1 4 Shift left 1 Branch MemRead Instruction [6-0] ControMemtoReg MemWrite ALUSrc RegWrite Instruction [19-15]Read Read register 1 Read Read data! PCaddress Instruction [24-20] Zero ALU ALU result register 2 Instruction 31-0 Instruction [11-7 Read1 Address data | Write Read register daiaALU | M Instruction memory Write data Registers Write Data data memory Instruction [30 32 Imm 64 ALU control Gen Instruction [30,14-12 FIGURE 4.17 The simple datapath with the control unit. The input to the control unit is the 7-bit opcode field from the instruction The outputs of the control unit consist of two 1-bit signals that are used to control multiplexors (ALUSrc and MemtoReg), three signals for controlling reads and writes in the register file and data memory (RegWrite, MemRead, and Mem Write), a 1-bit signal used in determining whether to possibly branch (Branch), and a 2-bit control signal for the ALU (ALUOp). An AND gate is used to combine the branch control signal and the Zero output from the ALU; the AND gate output controls the selection of the next PC. Notice that PCSrc is now a derived signal, rather than one coming directly from the control unit. Thus, we drop the signal name in subsequent figures. For Questions 1 to 11 Questions 1 to 11 deal with the processor datapath and control shown in Figure 4.17 of the textbook, executing the following instruction, located at address Ox0000000000204014 in the instruction memory: sd x7, 0x18(x24)

Answer 1

mem obite control Sqral to do wsdte The vae nem ul a oh mem ws Su Conmand valiuo of tho mem ostbe Contrel saral o memouy 4 Hux o)

ANSOER 6 ALusc ad memo