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conceptual doubt

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in case of hierarchical memory organization when there is a miss in cache , we need to bring the entire block from main memory to cache so in the formula-

AMAT= H1*T1+(1-H1(T1+T2))

T1- cache access time/word

T2= memory access time/word

T2 should be the entire block transfer time right? Why in some cases we just take word access time of main memory.

also please tell me what should be T2 in case of simultaneous organization?

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