KSZ8873MML Evaluation Board User’s Guide
Micrel, Inc.
January 11, 2011
Confidential
Rev. 1.1
9/11
closed.
b). 5 VDC power source from the USB port when JP44 pin 2-3 is closed.
6.
The KSZ8873MML will power up in its default configuration
7.
Open the Windows and navigate to the directory where the
“USB_SPI Software”
file
is stored. Click its icon to invoke the software.
8.
Program the desired settings using the Micrel SPI interface software. See the
USB_SPI Software User’s Guide
for details.
4.4 10/100 Ethernet PHY Ports
There are one 10/100 Ethernet PHY ports on the KSZ8873MML evaluation board. The ports can
be connected to an Ethernet traffic generator or analyzer via standard RJ-45 connectors using
CAT-5 cables. Each port can be used as either an uplink or downlink. Both ports support auto
MDI/MDI-X, eliminating the need for cross over cables.
4.5 LED Indicators
There is one column of LED indicator for one column for port 2. The LED indicators are
programmable to three different modes. LED mode is selected through register 195 bit [5:4]
setting. The LED mode definitions are specified in Table 3. See Figure 1 for the LEDs’ orientation
on the KSZ8873MML evaluation board.
Table 3: LED Modes
Register 195 Bit[5:4]
00
01
10
11
P2LED1 = Speed
P2LED1 = Active
P2LED1 = Duplex
P2LED1 = Duplex
P2LED0 = Link/Active
P2LED0 = Link
P2LED0 = Link/Active
P2LED0 = Link
The KSZ8873MML evaluation board provides two LEDs (P2LED1, P2LED0) for PHY port 2.
The KSZ8873MML evaluation board also has a power LED (D3) for the 3.3V power supply.
When D3 is lit, the board’s 3.3V power supply is “on”.
4.6 MII Port Configuration
The evaluation board provides access to the KSZ8873MML’s 1
st
and third MAC via the MII port
interfaces. The 1
st
and third MAC can be configured to MII PHY mode and MII MAC mode. To
configure the 1
st
and MAC, the board’s jumpers JP27 and JP26, respectively, are set as
specified in Table 4.
Table 4: MII Mode Settings
MII Mode
MII PHY mode
MII PHY mode
JP27 for Port 1
Pins 1-2 closed
Pins 2-3 closed
JP26 for Port 3
Pins 1-2 closed
Pins 2-3 closed
In MII PHY mode, the MII transmit and receive signals will be on J3 and J7, the male MII port
connectors. This mode is usually used to connect the KSZ8873MML to an external MAC
processor. In MII MAC mode, the MII transmit and receive signals will be on J4 and J6, the
