GPIO parameters are configurable in this page.Fixed values for each GPIO are shown for user information purposes. If GPIO is a fixed value, the pin configuration is not re-configurable. For example, in TPS25772-Q1, GPIO 0 and GPIO 1 are fixed as PB_CC1 and PB_CC2 for Port B USB Type-C PD communication purposes.

TPS25763-Q1 can control an external DisplayPort MUX via GPIO or I2C. This option is set in the “ALT MODE” pane. The GPIOs will automatically be assigned based on this selection. Channel 0 must be set to HPD for either case. For GPIO based control, one IO must be set as Output Event “Cable_Orientation_Event_Port1” to tell the MUX which way the reversible Type-C connector was plugged in, one as “USB3_Event_Port1,” to tell the MUX the to configure lanes for USB SS communication, and one as “DP_Mode_Selection_Event_Port1” to tell the MUX to configure lanes for DisplayPort.

When I2C control is used for the MUX, TPS25763-Q1 uses I2C1 to communicate with the MUX, freeing up IOs for other functions.