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1 February, 08:41

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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  1. 1 February, 10:12
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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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