implement the $16-$bit CPU

Note $1.$ The width of all registers and buses are $16$ bits.

Note $2.$ For IR register, use lower $14$ bits.

The components given are as follows $($no limits about the number of each components$)$:

$1.74$F$382.$ It is a $4-$Bit ALU from Fairchild semiconductor. Assume the operands are active

high.

$2.$ CY$74$FCT$2244$T$.$ It is an $8-$bit tristate buffer from Texas Instrument

$3.$ CY$74$FCT$2574$T$.$ It is an $8-$bit register.

$4.$ Any other gates that you need.

$($iii$)$ Assume R$1=0$x$0$DDDAAAA, R$2=0$x$0$FFFEEEE, and it uses active High

operands, how does it perform the following operations?

a$.$ ADD R$2,$ R$1($R$2$ is the destination register$)$

b$.$ SUB R$2,$ R$1($R$2$ is the destination register$)$

c$.$ AND R$2,$ R$1($R$2$ is the destination register$)$

d$.$ OR R$2,$ R$1($R$2$ is the destination register$)$