KSZ8851SNL-Eval Evaluation Board User’s Guide
Rev. 1.1
Micrel, Inc.
April 21, 2010
10/11
A dual LED indicator (LED1) is located adjacent to the RJ-45 Connector (J1). The top LED is
connected to LED1 (pin 32) and bottom LED is connected to LED0 (pin 1) of the KSZ8851SNL.
The two LEDs are programmable to LED mode ‘0’ or ‘1’ via register 0xC6 bits [9], and are defined
in the following Table 6.
LED Mode
0 (Default)
1
LED1 (Top)
100BT ACT
LED1 (Bottom)
LINK/ACT LINK
Table 6. KSZ8851SNL-Eval Port Status LED Definition
Table 7 shows the rest of LEDs definition.
LED
Color
Description
LED2
Green
Power Management Event (PME) Status
LED3
Red
3.3V Power available indicator
Table 7. KSZ8851SNL-Eval LED Definition
4.6 Board
Reset
The KSZ8851SNL-Eval generates a reset signal from the reset circuitry during power up. It also
provides a push button S1 reset circuit to reset the KSZ8851SNL device. During power up, the
board is automatically reset. User can also press reset button S1 on the board for a manual reset.
