The TLB lookup is combinational -- it evaluates in the same half-cycle as the limit check, requiring no additional clock. The common case (TLB hit, no page boundary crossing) adds zero overhead to a memory access. This is why the Segment Descriptor Cache and Page Cache (TLB) together occupy such substantial die area -- they are the fast path that makes protected mode competitive with real mode.
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"Many of these churches have been on these sites for probably 1,000 years, and probably as long as they've been standing they've had bats in them," says Diana Spencer, from the Bats in Churches Project.