$($e$)$ For the basic processing unit, assume that signals $T1$ to $T5$ are asserted

during the corresponding execution time step. Assume that signals Load,

Store, ALU, Call, Return, Branch are asserted based on the instruction being

executed. Write logic expressions for the control signals that are given below.

IR$\_$en $=$

MEM$\_$write $=$

$($g$)$ Briefly identify the data inputs to the multiplexer that is labelled as MuxY.

$($h$)$ Assume that reg. R$4$ has $08765$ and reg. R$3$ has $04321.$ Consider the

instruction: Subtract R$5,$ R$4,$ R$3.$ Complete the table for execution of this

instruction, reflecting contents of the internal registers RA$,$ RB$,$ RZ$,$ and RY$.$

Final contents of reg. $R5=$

Cycle