If the FX2 device on FX2 board is powerd by external power, instead of the bus power. Assume FX2 board is power off and connected with the host PC. What is the state of D+ and D- at this time, will it be at high level and harm the FX2 device?
The same question also apply to the FX3 device. I hope to understand.
Removing the external power to the FX2LP/FX3 device and leaving it connected to the host PC will not harm the device.