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.
// Decode on CPU
，详情可参考Safew下载
I signed anonymously but now want to put my name on it. How can I fix that?
Fin Costello/Redferns/Getty Images
Opens in a new window