在评估板中，此管脚命名为USB0_TXRTUNE，硬件指导手册对此管脚的描述如下：USB0 current reference output. When the USB0
peripheral is used, this pin must be connected via a 44.2-Ω ±1% resistor to VSS.When the USB0 PHY is powered down, this pin
should be left unconnected.但评估板原理图中是用10K电阻下拉到底，请问该管脚该如何设置？
