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其中，两个USB口只能有一个口能做OTG接口，核心板默认配置为USB2。

13.不能做输出的GPIO

以下引脚作为GPIO时，没有输出功能，只能做输入。

引脚编号引脚名称CPU引脚GPIO
X1B79X_JTAG_TDID23GPIO8_27
X2A48X_WAKEUP1AC17GPIO1_1
X1A45X_WAKEUP2AB16GPIO1_2