Objective: To Review the material taught in class in control unit Design.

Show the required micro$-$operations to fetch and execute each of the following in the following three$-$bus organization:

$($a$)$ The load and store instructions from $($into$)R1$

$($b$)$ the operation $M[R_0]larrM[R_0]+M[R_1].$

Assume that each register has a control signal at its input $(R_{in})$ and a control signal at its output $(R_{\text{o}\text{u}\text{t}}).$ State any other assumptions that vou mav make.

Suppose that the instruction set of a machine has four instructions: I$-1,$ I$-2,$ I$-3$ and I$-4$; and A$,$ B$,$ C$,$ D$,$ E$,$ F$,$ G and $H$ are the control signals. The following table shows the control signals that should be activated for the three instructions at the three$-$time steps $T0,T1,$ and $T2.$

$\backslash$table$[[$Time Step,I$-1,$I$-2,$I$-3,$I$-4],[$T$0,$D$,$ B$,$ E$,$F$,$ H$,$ G$,$E$,$ H$,$A$,$ C$,$ E$],[$T$1,$C$,$ A$,$ H$,$G$,$ E$,$D$,$ A$,$ C$,$B$,$ D$,$ F$],[$T$2,$G$,$ C$,$B$,$ C$,$B$,$ F$,$C$,$ E$,$ H$]]$

You are required to perform the following tasks:

$($a$)$ Write the logic $($Boolean$)$ expressions for all the control steps A$-$H$.$

$($b$)$ Draw the Schematic PLA representation of the hardwired control unit of that computer.

$($c$)$ Show the micro$-$programmed design of the control unit of that computer.

Note: first question needs to be writen in micro operation table, therefore the steps shoudn't be explained in words or sentences please!