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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.

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

Given the Parameters :

  • Hit rate = 92%
  • Hit latency = 2 cycle
  • Latency to memory + Cache miss penalty = 124 cycles

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

  • Average memory-access time (AMAT) = Hit latency + Miss rate x Latency to memory + Cache miss penalty

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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