Datasheet

KSZ9031RNX
DS00002117F-page 24  2016-2017 Microchip Technology Inc.
The MII management bus option gives the MAC processor complete access to the KSZ9031RNX control and status
registers. Additionally, an interrupt pin eliminates the need for the processor to poll the PHY for status change.
3.12 LED Mode
The KSZ9031RNX provides two programmable LED output pins, LED2 and LED1, which are configurable to support
two LED modes. The LED mode is configured by the LED_MODE strap-in (Pin 41). It is latched at power-up/reset and
is defined as follows:
• Pull-Up: Single-LED Mode
• Pull-Down: Tri-Color Dual-LED Mode
Each LED output pin can directly drive an LED with a series resistor (typically 220 to 470).
3.12.1 SINGLE-LED MODE
In single-LED mode, the LED2 pin indicates the link status while the LED1 pin indicates the activity status, as shown in
Table 3-9.
3.12.2 TRI-COLOR DUAL-LED MODE
In tri-color dual-LED mode, the link and activity status are indicated by the LED2 pin for 1000BASE-T; by the LED1 pin
for 100BASE-TX; and by both LED2 and LED1 pins, working in conjunction, for 10BASE-T. This is summarized in
Table 3-10.
TABLE 3-9: SINGLE-LED MODE - PIN DEFINITION
LED Pin Pin State LED Definition Link/Activity
LED2 H OFF Link Off
L ON Link On (any speed)
LED1 H OFF No Activity
Toggle Blinking Activity (RX, TX)
TABLE 3-10: TRI-COLOR DUAL-LED MODE - PIN DEFINITION
LED Pin (State) LED Pin (Definition)
Link/Activity
LED2 LED1 LED2 LED1
H H OFF OFF Link Off
L H ON OFF 1000 Link/No Activity
Toggle H Blinking OFF 1000 Link/Activity (RX, TX)
H L OFF ON 100 Link/No Activity
H Toggle OFF Blinking 100 Link/Activity (RX, TX)
L L ON ON 10 Link/No Activity
Toggle Toggle Blinking Blinking 10 Link/Activity (RX, TX)