Ethernet PHY LED Interface

ZCU111 Evaluation Board User Guide (UG1271)

Document ID

UG1271

Release Date

2023-04-28

Revision

1.4 English

[ 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 .

Table 3-15: Ethernet PHY LED Functional Description
DP83867IR PHY U37 Pin		Type	Description
Name	Number	Type	Description
LED_2	61	S, I/O, PD	By default, this pin indicates receive or transmit activity. Additional functionality is configurable using LEDCR1[11:8] register bits. Note: This pin is a strap configuration pin for RGZ devices only.
LED_1	62	S, I/O, PD	By default, this pin indicates that 100BASE-T link is established. Additional functionality is configurable using LEDCR1[7:4] register bits.
LED_0	63	S, I/O, PD	By default, this pin indicates that link is established. Additional functionality is configurable using LEDCR1[3:0] register bits.

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 21] . 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).