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Suppose that one of the following control signals in the single-cycle MIPS processor has a stuck-at-0 fault, meaning that the signal is always O, regardless of its intended value. What instructions would malfunction? Why? (a) RegWrite (b) ALUOp1 (c) MemWrite Repeat for all three signals (a) to (c) above, assuming that the signal has a stuck-at-1 fault.

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Answer:

Explanation:

RegWrite:

• All R-type instructions, lw and addi:

• The result of the operation/load/addition would not be written back to the destination register

• ALUOP

• The following R-type instructions: add, sub, and, or, slt

• With ALUOp stuck at 0, the ALU decoder would interpret all those instructions as either add or subtract operations. The ALUOp gets decoded to add or subtract depending on ALUOp[0].

• MemWrite:

• Only sw is affected.

• The memory write won’t take place.