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您好,
触发器在上电之后的输出状态是不确定的,这是由其输出结构决定的。由于制造和系统负载的缺陷,闭锁设备可能每次都以相同的方式启动,即使多次测试也是如此。需要注意的是,这不能保证输出始终是该值。具体分析见下面链接FAQ:
[FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)