Question

3. Assume the processor data path show below. XE30 Add Add ALU result Shift left 2 RegDst Branch MemRead Instruction (31-26]
) Determine the value of control signals (all ports going out of Control oval for precise execution of store instruction (not
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Answer #1

(1)Control signals for store instruction
RegDst = X (don't care)
Branch = 0
MemRead = 0
RegSrc = X (don't care)
ALUOp = Add
MemWrite = 1
ALUSrc = 0
RegWrite = 0

(2) RegDst = 0
For I-type instructions, RegDst = 1
All I-type instrictions (except sw) will not work properly.

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