PART TWO: Answer the following questions $($short answers$).$ Write your answer in the designated space on the cover page. ONaty the cover page will be graded.

$($Questions $17$ and $18)$ Datapath components are instruction memory, register file, sign$-$extend. unit, ALU and data memory. Ust the components that are imvolved in esecuting each of the following instructions, in addtion to the instruction memory?

$[2$ points$]$

$\backslash$table$[[$Na$.,$Instruction,Components$],[17,$Iw $$s1,20|$$$s2|,],[18,$sub $$s1,$$$s2,$$$s3,]]$

$($Questions from $19$ to $21)$ Consider a direct$-$mapped cache with $16KB$ of data with $2-$word blocks. Assuming a $32-$bit address, $4-$byte words, and a byte$-$addressable memory, answer the following questions:

$[3$ points$]$

$\backslash$table$[[$Ne$.,$Question,Answer$],[19,$What is the total number of blocks in the cache?,$],[20,$How many bits are required for the index?,$],[21,$How many bits are required for the tag?,$]]$

Questions $(22$ and $23)$ are based on the following MiPS code fragment:

$[2$ points$]$

slti $:$2,$$$s2,5$

beq $$22,$$ zero, $12$

addi $$s1,$$$s1,3$

$L2$:$-{?}_{-}$

$\backslash$table$[[$No$.,$Question,Answer$],[22,\backslash$table$[[$Assuming that initially register $$s1$