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28335+usb通讯问题

Other Parts Discussed in Thread: CONTROLSUITE

设计一个28335与USB芯片ch372通信,采用28335的数据总线,将zone0的片选、使能信号直接和Ch372连接。测量信号,DSP的片选及使能都有信号,低电平宽度在400ns左右,但是就是在中间位置有个尖峰,不知道为什么?