power flow control

USB Logic control for SDR1096-DAT

Logic-gate

• OE stay off by pull up resistor (default)
• OE turn on by USB_ID or PA28_USB_HOST_EN pull down
  • USB_ID or PA28_USB_HOST_EN pull down further turn on mos-p
  • VBUS -> VIN via mos-p (default off by pull up resistor)