Question: Repeat Problem 12-11 if the cache access time from the CPU is 1 ns and the main memory has an access time from the CPU

Repeat Problem 12-11 if the cache access time from the CPU is 1 ns and the main memory has an access time from the CPU of 20 ns.

Problem 12-11

A cache memory has an access time from the CPU of 4 ns, and the main memory has an access time from the CPU of 40 ns. What is the effective access time for the cache–main memory hierarchy if the hit ratio is:

(a) 0.91.

(b) 0.82.

(c) 0.96.

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