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发现TUSB8020这块板子和电脑连接后,DP引脚有3.06V电压,DM引脚电压为0。请问这正常吗?我侧过其他正常枚举的USB设备,连接后电压这两条线电压都为0,是不是这个原因造成tusb8020不能正常枚举的呢?造成这种情况可能的原因有哪些?原理图检查了没问题的。