Problem $1(30$ Points$)$

We need to extend the above RISC$-$V single$-$cycle datapath and control block diagram to

implement the slli instruction by adding the shifter shown below. This shifter must be added

to the datapath as a separate circuit from the ALU. You will need to add a new control signal

named Shift. The slli instruction is an I$-$type instruction with the following format

slli rd$,$rs$1,$imm

The instruction shifts left the value in the rs$1$ a number of bits

equal to the $5-$bit value stored in the imm field and stores that

value in register rd$.$ The figure shows the shifter to be used.

a$)$ Draw the extended block diagram to include the new proposed

control signal, the shifter circuit, and any needed additional

circuits. Make sure to label any added line following the same

labeling technique shown in the above block diagram.

b$)$ Extend the "Control Unit $-$ Instruction Decoder" table in the

lecture slides to reflect the support for the new slli instruction. Add to the table a new

column for the new Shift signal.