Will ask question twice so the question will be worth 3000 points. 6 instruction

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Will ask question twice so the question will be worth 3000 points.

6 instruction processor circuit --Extending the Control-Unit and Datapath

The load constant instruction requires that the register file be able to load data from IR[7..0], in addition to data from data memory or the ALU output. Thus, we widen the register file's multiplexer from 2 times 1 to 3 times 1, add another mux control signal, and also create a new signal coming from the controller labeled RF_W_data, which will connect with IR[7..0]. The subtract instruction requires that we use an ALU capable of subtraction, so we add another ALU control signal. The jump-if-zero instruction requires that we be able to detect if a register is zero, and that we be able to add IR[7..0] to the PC. We insert a datapath component to detect if the register file's Rp read port is all zeros (that component would just be a NOR gate). We also upgrade the PC register so it can be loaded with PC plus IR[7..0]. The adder used for this also subtracts 1 from the sum, to compensate for the fact that the Fetch state already added 1 to the PC.

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