KSZ9021RL-EVAL Board User’s Guide
Micrel, Inc.
March 20, 2009
Rev.
1.0
10/24
4.4 LED
Indicators
The KSZ9021RL device provides two programmable LED output pins, LED2 (pin 19) and LED1
(pin 21). On the KSZ9021RL-EVAL board, these two LED pins are connected to two sets of LEDs
to support two LED configurations: Single LED mode and Tri-color Dual LED mode.
4.4.1
Single LED Mode
To enable Single LED mode,
•
Close pins (1, 2) of jumpers JP26 and JP27 to select D2 and D1, respectively for the
single LEDs.
•
Close pins (1, 2) of jumper JP20 to set the LED_MODE strap-in for Single LED mode.
•
Power-up the board.
After board power-up, the on-board D2 and D1 LEDs are defined as follows:
LED
LED Definition
Link / Activity
OFF Link
off
D2
Green – ON
Link on (any speed)
OFF No
Activity
D1
Green – Blinking
Activity (RX, TX)
Table 4: Single LED Mode – LED Definition
4.4.2
Tri-color Dual LED Mode
To enable Tri-color Dual LED mode,
•
Close pins (2, 3) of jumpers JP26 and JP27 to select D10 for the tri-color dual LED.
•
Close pins (2, 3) of jumper JP20 to set the LED_MODE strap-in for Tri-color Dual LED
mode.
•
Power-up the board.
After board power-up, the on-board D10 LED is defined as follows:
LED: D10
Link / Activity
OFF Link
off
Green – ON
1000Mbps Link / No Activity
Green – Blinking
1000Mbps Link / Activity (RX, TX)
Red – ON
100Mbps Link / No Activity
Red – Blinking
100Mbps Link / Activity (RX, TX)
Orange – ON
10Mbps Link / No Activity
Orange – Blinking
10Mbps Link / Activity (RX, TX)
Table 5: Tri-color Dual LED Mode – LED Definition
