Let us use a translation look$-$aside buffer called TLB that is fast$-$lookup hardware cache with the access time can be neglected or in other words, zero. We assume the average memory access time is $20$ns$.$ If the hit ratio is $90\%,$ what is the effective access time $($EAT$)?$ What is the slowdown ratio due to miss?

If we get the EAT is $20\%$ greater than the memory access time, what is the hit ratio H we desire?

b$.$ Let us consider a similar solution but the fast cache access needs time as well. Assume it needs $5$ns$.$ Also assume the memory access is $20$ns$.$ So$,$ all access has two accesses, one for table lookup and one for data and instruction. The only difference is that one for hit it needs $25$ns while for miss is needs $40$ns$.$ We can calculate the effective access time like a$)$ as well. If the hit ratio is $90\%,$ what is the EAT? What is the slowdown ratio due to miss? If the EAT is $20\%$ greater than the hit memory access time, what is the hit ratio H