For a data cache with a 92% hit rate and a 2-cycle hit latency, calculate the average memory access latency. Assume that latency to memory and the cache miss penalty together is 124 cycles.

Using the Average Memory Access Latency relation, the AMAT value in the scenario described would be 11.92 ns

Given the Parameters :

The Average - Memory Access Time can be calculated using the relation :

The AMAT = 2 + [(1 - 0.92) × 124]

AMAT = 2 + (0.08 × 124)

AMAT = 2 + 9.92 = 11.92 ns

Therefore, the average memory access latency is 11.92ns.

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AMAT is 11.92ns.

Explanation:

Given,

Hit rate = 92%

Hit latency = 2 cycle

Latency to memory + miss penalty = 124 cycles

Average Memory Access Latency = ?

We know,

Average memory-access time (AMAT)  = Hit time + Miss rate x Miss penalty

So,

If hit rate is 92% then the miss rate would be 8%

Thus,

AMAT = 2 + 0.08 X 124

AMAT = 11.92ns

Therefore, AMAT is 11.92ns.

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