Multiplier Units. $[5$ points$]$ Explain how to implement an $8-$bit unsigned multiplier for the product a$$x$.$ You may choose a simple shift$-$and$-$add design or a similar approach. $($b$)8-$bit Iterative Update Unit. $$ Design a combinational block that produces the new value of xnext $=$ a $$ xcurrent $+$ b from the present xcurrent. $$ This block will contain an $8-$bit multiplier for a $$ x and an $8-$bit adder for adding b$.$ The output is an $8-$bit result xnext. $($c$)$ Load Control. $$ Use an $8-$bit register X to store the current x$,$ as well as two $8-$bit registers for a and b$.$ Show how X$,$ a$,$ and b are loaded when Load is $1.($d$)$ Iteration Control. $$ On each clock cycle $($with Load $=0),$ X is loaded with xnext. $($e$)$ Stop Control. $$ Show how Done is set to $1$ when xnext $=$ xcurrent $($i$.$e$.$ the iteration has reached a fixed point$).$ For a problem like this, you must explain and annotate your circuit schematics, as well as your simulation results. The grading will be somewhat subjective. If the grader cannot understand your schematics or annotations, you will not get full points, even if you can argue afterwards that the circuit works