$1.$ Create a start$-$stop flag as follows:

If S$==1,$ it operates normally,

If S$==0,$ it stops operation $($stops the clock$).$

$2.$ Based on the $16-$bit carry lookahead adder in the photo, create a computation device circuit that can perform the following six functions.

$3.$ Use the computation device and sequence controller created in step $2$ to conduct the following test:

$($Both AC and DR are $16-$bit registers.$)$

T$0$: DR $3($Load DR with immediate value $3)$

T$1$: AC $2($Load AC with immediate value $2)$

T$2$: EAC $$ AC $+$ DR $($Add$)$

T$3$: S $0($Stop the clock$)$

$4.$ Complete the CPU as follows, making modifications from the textbook CPU by adding one register and improving the instructions as follows:

$(1)$ Add a CTR $($Counter Register$)$ with three control points: LOAD, INR, and CLEAR.

$(2)$ Increase the Operation code part from $3$ bits to $4$ bits to accommodate an additional Memory reference instruction, and reduce the address bit from $12$ bits to $11$ bits.

$(3)$ Remove the ISZ $($Increment and Skip if Zero$)$ instruction from Memory reference instructions and add the following two instructions:

$$ LDCTR $($Load Counter Register$)$

$$ STCTR $($Store Counter Qu Register$)$

$(4)$ Add INCCTRSZ $($Increment CTR and Skip if Zero$)$ to Register Reference instructions.

$(5)$ For direct addressing in Memory reference instructions, eliminate the action of pausing for one cycle at T$3.$

Must specify the following:

$(1)$ RTL list for Instruction set $($including improved version$)$ with comments

$(2)$ Full control circuits in LogicWorks

Please solve these problems and explain. Thankus.