[This Figure, callout 9]
The DP83867IRPAP PHY U37 LED interface (LED_0, LED_2) uses the two LEDs embedded in the P12 RJ45 connector bezel. The LED functional description is listed in Table: Ethernet PHY LED Functional Description.
The LED functions can be repurposed with a LEDCR1 register write available via the PHY's management data interface, MDIO/MDC. LED_2 is assigned to ACT (activity indicator) and LED_0 indicates link established. For more Ethernet PHY details, see the TI DP83867 data sheet [Ref 20]. LED_1 (100BASE-T link established) is a separate LED DS27 located on the top side of the board near the RJ45 P12 connector (This Figure, callout 12).