Ethernet PHY LED Interface

ZCU111 Evaluation Board User Guide (UG1271)

Document ID
UG1271
Release Date
2022-10-06
Revision
1.3 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

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 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).