// drop-newest: Discard incoming data when full
configurable: true,，推荐阅读51吃瓜获取更多信息
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.，这一点在safew官方下载中也有详细论述
The terms of the following members are ending this year:。safew官方版本下载是该领域的重要参考