Describe the effect that a single stuck-at-0 fault would have for the signals shown below, in the single-cycle datapath in Figure 5.17. Which instructions, if any, will not work correctly? Explain why. Consider each of the following faults separately: a. RegWrite = 0 b. ALUop1 = 0 c. ALUop0=0 c. Branch = 0 d. MemRead = 0 e. MemWrite = 0

ALU Shift left 2 ALUSic 521 Road Road rogisder f Read data t rogeder 2 20-16 31-0 ogindor data 2 data 16 Sigm extend 15-0 32 ALU control Instruction 15- FIGURE 5.17 The simple datapath with the control unit. The inpat to the control unit is the 6 bit opcode field from the instraction. The outputs of the control unit comist of three I bit signals that are used to control nltiplesors (RegDst, ALISec, and MemioRay), three signals for con trolling reals and writes in the egister file and data me nory (Regwrite Menkeal, anl MeWrite), a bit signal ised in determin ng whether to possibly branch (Branch), and a 2-bit control signal for the ALLU (ALLOp). An AND gate is used to combine the branch control signal and the Zeso outpuhom the ALU: the AND gle output controls the selection of the next K. Notice that KMc is now a lerived segnal father than one coming directly from the control unit.Thas we drop the signal name in beqent figures