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Calculating cache penalty

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For a system with two levels of cache, define $T_{c1}$ first-level cache access time; $T_{c2}$ second-level cache access time; $T_m$ memory access time; $H_1$ first-level cache hit ratio; $H_2$ combined first/second level cache hit ratio. Provide an equation for effective access time $T_a$  for a read operation.

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