Compare between bus organization, scratchpad memory and two port memory system. $2.($a$)$ For a processor unit with $16-$bit control word variable, prepare the control words using Table $1$ for the below listed micro$-$operations: i$)$ R$1$R$1+$R$5$ ii$)$ R$30$ ii$)$ R$1+$R$2,$C$41$ iv$)$ R$4$SHL R$6$ v$)$ R$7$ CLC R$3$ vi$)$ R$5$R$1-$R$4-1$ vii$)$ R$2$R$6-1$ viii$)$ R$2$SHR R$5$ ix$)$ R$4$ CRC R$1$ x$)$ R$61($b$)$ Draw the flow chart of sign magnitude addition and subtraction of A & B$,$ according to control logic diagram, include all the steps and then draw the control state diagram. Include control state outputs using microinstructions table also. $3.($a$)$ Design a $3-$bit shifter for the shift operations listed in Table $1($b$)$ Design a $3-$bit ALU using table $1$ Table $1$: Function of selection variables Binary Code F with F with B A D H Cin $=0$ Cin$=1$ Input $000$ Data Input Data Circulate$-$Right with Carry A A$+1$ None $001$ R$1$ R$1$ R$1$ A$+$B$\text{'}+1$ A$+$B $010$ R$2$ A$+$B A$+$B$+1$ A$-1$ R$2$ R$2$ Circulate$-$Left with Carry No shift l$\text{'}$s to the output Bus $011$ R$3$ R$3$ R$3100$ R$4$ R$4$ A XOR B R$4101$ R$5$ R$5$ R$5$ Shift Left with IL$=0$ Shift Right with Ir$=0110$ R$6$ A$\text{'}$ A AND B A ORB R$6-$ R$6111$ R$7$ R$7$ R$7$ O$\text{'}$s to the output Bus