PLEASE ANSWER IN LT SPICE OR A SIMILAR PROGRAM, IN DETAIL.

a$)$ We first change part of diagram shown in the following figure. The goal is to set the

correct next PC value at the output of Mux$3.$ We will need a new Mux. We call it Mux$4.$

The output of Mux$4$ is PCRef $($the reference PC$).$ In addition, we need to change how the

select signal of Mux $3$ is generated. Let us call the new select signal PCStrcI. Include the

following in your submission. Your diagram must be clean.

Write the logic expression that generates RCSrcI from signals from the $($main$)$ control

and ALU.

Draw a new diagram that includes Mux$4$ and new logic that generates PCSrcI. Label

every signal in your diagram. The figure below has only two signals labeled $($BT and

PCSic$).$

b$)$ We then change part of diagram shown in the following figure. The goal is to set the

correc$2$t value on Write Data. We will need to add a Mux. Let us call it Mux $5.$ The

output of Mux$5,$ ExResult, is connected to input $0$ of Mux$2.$ Mux $5$ is controlled by an

existing signal $($i$.$e$.,$ there is no need to add logic to generate the select signal of Mux$5).$

Draw a new diagram that includes Mux$5.$ Label every signal in your diagram. Your

diagram must be clean.

c$)$ Specify the value of control signals for JAL and JALR.

Inst.

ALU Src

Memta Reg

Reg Write

Mem Read

Mem Write

Branch J JR JAL JALR