The effect that a single stuck-at-1 fault

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Question 1

Describe the effect that a single stuck-at-1 fault (i.e., regardless of what it should be, the value is always 1) would have in each of the following cases, in the single clock cycle datapath discussed in class (see Figure 4.17 in the text). Which instructions, if any, will not work correctly? Explain why. (With respect to ALUOp1 and ALUOp0, assume that ALU control is implemented so that when both are 1, the outcome is the same as for ALUOp1 = 1, ALUOp0 = 0.) Consider each of the following faults separately:

a. Branch = 1

b. ALUOp0 = 1

c. ALUOp1 = 1

d. RegDst = 1

e. ALUSrc = 1

Note: Refer to section 4.4 in the text for ALU Op lines, specifically, the ALU Control section along with Figure 4.12.


Describe the modifications to the single clock cycle datapath that would be needed to implement the jalr instruction (jump and link register – see page B.64 of the text), and give the control signal settings that would be required for this instruction.

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