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.
На Западе подчинили рой насекомых для разведки в интересах НАТО08:43
Мерц резко сменил риторику во время встречи в Китае09:25。业内人士推荐同城约会作为进阶阅读
Фото: Yves Herman / Reuters。搜狗输入法2026对此有专业解读
2024年12月20日 星期五 新京报
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