$2.(3$ marks$)$ Let $\backslash ($ A $\backslash )$ and $\backslash ($ B $\backslash )$ represent four$-$digit binary integers, which are stored in registers. The following ASM chart calculates the integer part of $\backslash (\backslash$frac$\{$A$\}\{$B$\}\backslash ),$ putting the result in $\backslash ($ R $\backslash )$ :

$($a$)(2$ marks$)$ Implement the controller for this ASM chart.

$($b$)(1$ mark$)$ Explain the status signals returned from the datapath to the controller, and explain how the datapath would handle each command from the controller. There is no need to implement the datapath.$|$