In an instruction execution pipeline, the earliest that the data TLB (Translation Lookaside Buffer) can be accessed is

before effective address calculation has started
during effective address calculation
after effective address calculation has completed
after data cache lookup has completed

Correct answer: during effective address calculation

Solution

The data TLB is accessed during effective address calculation because it is responsible for translating virtual addresses to physical addresses, which is a critical step that occurs while the effective address is being determined.

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