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Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
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《殉道学》的翻译、编辑和校对共历时五年。“遇到的困难几乎无处不在，每一处都需要反复推敲。”李芝芳回忆。日记原文中有大量的简写、缩略语，有时一句话只剩两三个看似无关的单词，甚至几个字母。俄文版对这类内容原样保留，但若直接翻译，势必给中文读者造成巨大的阅读障碍。两位译者反复揣摩塔可夫斯基的创作语境和日常心境，尽可能还原他的完整表述，为每一个俚语、每一处缩写找到妥帖的中文表达。，更多细节参见搜狗输入法2026
接下来的几分钟，直到视频结束，现场一片混乱。
The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.，更多细节参见搜狗输入法2026