Suppose single$-$cycle MIPS implementation is extended so that it handles the $$ldnew$$ instruction, where $$ldnew$$ has R$-$type instruction format. An example is given below:

Example: ldnew $s$1,$ $s$2,$ $s$3$ # $s$1=$ Memory $[$$s$2+$ $s$3]$

# It sums two registers to obtain the effective load address.

PART A: Explain the requires changes in the complete single$-$cycle datapath in the figure clearly $($including changes in any component of the datapath including ALU, additional wires, muxes and control$/$selector signals$).$

In case of no changein the datapath, then express it accordingly.

$**$The answer to the part a of of this question says that there are no changes in the datapath. Can you explain how is the existing datapath sufficient? Which units does ldnew use? What steps are taken when it's being executed?

PART B: For the ldnew instruction, write the values of control lines given in table $($in the figure$).$ Explain each value please. Thanks a lot.