On a USB transceiver, is it required for the D+ line to be connected to the PUR pin? Or can the D+ line be pulled up to an external +3.3V net?
I am trying to troubleshoot an issue with a custom MSP430F5638 board where the host is failing to enumerate the device. USB_connectionState() constantly returns "ST_ENUM_IN_PROGRESS" when attempting to enumerate. The D+ line is pulled up to an external +3.3V net (same one that is used to power DVCC) and is not connected to PUR at all.
Thanks,
Jason