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Considering the Effect of Faults

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Describe the effect that a single stuck-at-0 fault (i.e., regardless of what it should be, the signal is always 0) would have for the signals shown below, in the single-cycle datapath in Figure 5.17 on page 307. Which instructions, if any, will not work correctly? Explain why. Please see attached file.

Consider each of the following faults separately:

a. RegWrite = 0

b. ALUop0 = 0

c. ALUop1 = 0

d. Branch = 0

e. MemRead = 0

f. MemWrite = 0.

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The solution considers the question regarding the effect of fault in the single-cycle datapath.

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a) RegWrite = 0
If RegWrite is stuck at 0, no register values will ever be able to change after that point. This means pretty much all arithmetic instructions will fail to execute properly.
b) ALUop0 = 0
Instructions that have ALUop0 asserted ...

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