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.

Explanation:

RegWrite:

• AllR-type instructions, lw and addi:

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

• ALUOP

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

• With ALUOpstuck at 0, the ALU decoderwould interpret all thoseinstructions as either add orsubtractoperations. The ALUOp getsdecodedto add orsubtract dependingon ALUOp[0].

• MemWrite:

• Only sw is affected.

• The memory write won’t take place.

(because i need 20 chars)