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USB OTG VBUS issue??

Other Parts Discussed in Thread: TPS65920, DM3730

Hi,

    DM3730 USB OTG with TPS65920 USB PHY, the WinCE version is BSP_WINCE_ARM_A8_01_02_00.

    my problem:

    If usb is connected to PC, The system is able to suspend, and wake up is normally.

    if usb is disconnect, The system is able to suspend, But wake up there will be a system exception(EHCI dll)

    This means that VBUS voltage has relationship with this problem

    I don't know why. How to debug this issue?

    thank you.