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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神舟二十一号的任务中，携带了4只实验小鼠中，其中的一对小鼠夫妇已经顺利生下了三窝健康鼠宝宝。据介绍，小鼠和人类基因的相似度高达85%，各种实验对人类具有重要的参考价值。