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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Things are feeling positive. Not wanting to get ahead of ourselves, but everything that we thought that was going to be happening looks like it’s happening … Whatever happens, I think it’s fair to say that Greens are here to stay now as a progressive voice in British politics.。雷电模拟器官方版本下载是该领域的重要参考
Either way, the delay slots do useful work: they compute the descriptor address and start reading it from memory. By the time the PLA verdict arrives, the hardware is already prepared for whichever path is selected. No cycles are wasted.，这一点在同城约会中也有详细论述