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.
长江之滨，湖北宜昌，山野间、公园里、小巷中，蜡梅花迎风绽放，暗香浮动。浅黄色的小小花朵缀满枝头，或舒展盛开，或含苞待放，似点点繁星，作别冬日的萧索，带来新春的暖意。
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习近平总书记强调：“检验我们一切工作的成效，最终都要看人民是否真正得到了实惠，人民生活是否真正得到了改善，人民权益是否真正得到了保障。”
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2026-02-27 00:00:00:0 （2026年2月26日第十四届全国人民代表大会常务委员会第二十一次会议通过）