Digilent Eclypse Z7 Hardware Reference Manual page 29

Two status indicator LEDs are located on the RJ-45 connector (J3) that indicate traffic
(J3/LD2, right side of connector) and valid link state (J3/LD1, left side of connector).
Table 11.1 shows the default behavior.
Table 11.1: Ethernet status LEDs
Function Designator
LINK J3/LD1
Figure 11.1: Ethernet PHY signals
State
Steady on
Blinking 0.4s ON, 2s OFF
Description
Link 10/100/1000
Link, Energy Efficient Ethernet (EEE) mode