Q. 16 A computer system has an L1 cache, an L2 cache, and a main memory unit connected as shown below. The block size in L1 cache is 4 words. The block size in L2 cache is 16 words. The memory access times are 2 nanoseconds. 20 nanoseconds and 200 nanoseconds for L1 cache, L2 cache and main memory unit respectively.
When there is a miss in L1 cache and a hit in L2 cache, a block is transferred form
L2 cache to L1 cache. What is the time taken for this transfer ?
(A) 2 nanoseconds
(B) 20 nanoseconds
(C) 22 nanoseconds
(D) 88 nanoseconds
Answer: (C)
Explanation:
