I am using the USBHS in "host" mode on the S7G2 board
How does over currrent detection work via pin "P707" ?
Power-up via the "PB00" pin is automatic when the USB thread is started.
Overcurrent detection pin on Synergy is an input pin that can be monitored by USB peripheral. It is usually connected to an output pin of the USB power switch.
VBUS Enabled pin is already controlled by sf_el_ux framework and again, usually it is connected to the USB power switch.
For more details, I suggest looking at reference design of SK-S7G2, DK-S7G2 and S7G2 MCU user's manual regarding USBHS:
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