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SN74V245空和满状态都有效,为什么?

Other Parts Discussed in Thread: SN74V245

我用了一片SN74V245来连接高速AD和DSP,上电后DSP给FIFO复位信号,测试过复位信号没问题。现在的问题是不管复不复位,SN74V245的空和满信号都同时有效,这应该不对吧。下面是我的原理图