Control signals

Which control signal selects between the register destination fields rt and rd in MIPS?

• ALUSrc
  
  
  

• RegDst

• MemtoReg

• Branch

What is the value of MemtoReg for an lw instruction?

• 0

• 1

• Depends on opcode

• None of the above

Which control signal determines whether the second ALU operand comes from the register file or from the sign-extended immediate?

• MemRead

• RegWrite

• ALUSrc

• PCSrc

For an R-type instruction, which of the following signals is 1?

• RegDst, RegWrite

• MemWrite, MemtoReg

• ALUSrc, MemRead

• Branch, MemWrite

The control signal RegWrite is 0 for __________ and 1 for R-type instructions.

The control signal MemWrite is set to 1 only for the __________ instruction.

Which control signal is responsible for deciding whether the ALU should perform addition, subtraction, AND, OR, etc.?

• ALUSrc
  
  
  

• ALUOp

• PCSrc

• MemWrite

Which pair of control signals must be set for a beq instruction to branch correctly?

• Branch = 1, Zero = 1

• MemRead = 1, Zero = 1

• ALUSrc = 1, RegWrite = 1

• MemWrite = 1, Branch = 1