Ethernet PHY LED Interface

VEK280 Evaluation Board User Guide (UG1612)

Document ID
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1.1 English

[Figure 1, callout 19]

The ADIN1300 PHY (GEM0 U198) controls two LEDs in the J307 two port connector bezel. The PHY signal LED0 drives the green LED, and LED1 drives the yellow LED.

The LED functional description is listed in the following table.

Table 1. Ethernet PHY LED Functional Description
ADIN1300 PHY Pin Description
Name Number
LED_1 26 By default, this pin indicates that 100BASE-T link is established. Additional functionality is configurable using LEDCR1[7:4] register bits. The LINK_ST pin is a general-purpose output used to indicate to the MAC whether a valid link has been established.
LED_0 21 By default, this pin indicates that link is established. Additional functionality is configurable using LEDCR1[3:0] register bits.

The LED_0 can be used to indicate the speed of operation, link status, and duplex mode.

By default, LED_0 illuminates when a link is established and blinks when there is activity. The default LED operation can be overwritten in software using the PHY LED control registers, LED_CTRL_1, LED_CTRL_2, and LED_CTRL_3 (Register Address 0x001B, Register Address 0x001C, and Register Address 0x001D, respectively).

The LED functions can be repurposed with a LEDCR1 register write available via the PHY's management data interface, MDIO/MDC.

See the ADI ADIN1300 RGMII PHY data sheet at the Analog Devices website for component details.

The detailed device connections for the feature described in this section are documented in the VEK280 board XDC file, referenced in Xilinx Design Constraints.