Micrel KSZ8873MML User manual

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KSZ8873MML
Evaluation Board User’s Guide
KSZ8873MML Integrated 3-Port 10/100 Managed Switch with PHYs
Revision 1.1 January 2011
© Micrel, Inc. 2011
All rights reserved
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United States and certain other countries. All other trademarks are the
property of their respective owners.
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is
assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without
notification to the customer. Micrel Products are not designed or authorized for use as components in life support
appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury.
Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b)
support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user.
A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own
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KSZ8873MML Evaluation Board User’s Guide
Micrel, Inc. January 11, 2011
Confidential Rev. 1.1
2/11
Revision History
Revision Date Summary of Changes
1.0 04/30/09 Initial Release
1.1 01/11/11 Update description

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Table of Contents
1.0 Introduction ............................................................................ 4
2.0 Board Features....................................................................... 4
3.0 Evaluation Kit Contents......................................................... 4
4.0 Hardware Description ............................................................ 4
4.1 Strap In Mode .......................................................................................................... 5
4.1.1 Feature Setting Jumpers........................................................................... 6
4.2 I2C Master (EEPROM) Mode .................................................................................. 7
4.3 SPI Slave Mode ....................................................................................................... 8
4.4 10/100 Ethernet PHY Ports..................................................................................... 9
4.5 LED Indicators......................................................................................................... 9
4.6 MII Port Configuration ............................................................................................ 9
5.0 Reference Documents ......................................................... 10
List of Tables
Table 1: Feature Setting Jumpers .................................................................................................. 6
Table 2: Reserved Jumpers ............................................................................................................ 7
Table 3: LED Modes....................................................................................................................... 9
Table 4: MII Mode Settings............................................................................................................. 9
List of Figures
Figure 1: KSZ8873MML Evaluation Board Block Diagram ............................................................ 5

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1.0 Introduction
The KSZ8873MML is Micrel’s third generation fully integrated 3-port switch. The PHY units
support 10BASE-T and 100BASE-TX. The device has been designed for cost sensitive systems,
however, still offers a multitude of features, such as switch management, port and tag based
VLAN, QoS priority, Two MII interfaces and CPU control and data interfaces.
The KSZ8873MML is an excellent choice for VoIP Phone, Set-top/Game Box, SOHO Residential
Gateway, industrial Ethernet systems and as a standalone 3-port switch.
The KSZ8873MML Evaluation Board provides a convenient means to evaluate the
KSZ8873MML’s rich feature set. Easy access is provided to all of the KSZ8873MML pins, with
jumpers and interface connectors allowing quick configuration and re-configuration of the board.
MIIM, EEPROM programming, SPI emulation software are also provided to access the more
extensive features of the KSZ8873MML, via a PC USB port.
2.0 Board Features
•Micrel’s KSZ8873MML Integrated 3-Port 10/100 Managed Ethernet Switch
•One RJ-45 Jacks for Ethernet LAN Interfaces with corresponding Isolation Magnetics
•Auto MDI/MDI-X on the PHY port
•PHY Mode and MAC Mode MII Connector for the Switch MII Interface
•1 USB port to emulate an MIIM, EEPROM, SPI Interface
•On board EEPROM
•2 LEDs to Indicate the Status and Activity of the RJ45 port
•1 power jack for 5VDC Universal Power Supply
3.0 Evaluation Kit Contents
The KSZ8873MML Evaluation kit includes the following:
•KSZ8873MML Evaluation Board Revision 1.0
•KSZ8873MML Evaluation Board User’s Guide
•Micrel USB Configuration Software Version 1.05
•KSZ8873MML Evaluation Board Schematic Revision 1.0
(Contact your Micrel FAE for the latest schematic)
Note: USB cable and 5V DC Wall Power Supply is not included in the design kit (the dimension of
the output plug of 5V DC wall power supply is 2.5x5.5x9.5mm or 0.1x0.218x0.375inch)
4.0 Hardware Description
The KSZ8873MML Evaluation Board is in a compact form factor and can sit on a bench near a
computer. There are three options for configuration: strap in mode, EEPROM mode, and SPI
mode. Strap in mode configuration is easily done with on board jumper options. EEPROM mode
and SPI mode are accomplished through a built in USB port interface. With the Micrel software
and your PC, you can use the USB port to reprogram the EEPROM on board, or use the SPI
interface to access the KSZ8873MML’s full feature set. The board also features two MII
connectors for the Switch MII interface. These are to facilitate connections from the switch to
either the external CPUs or the external PHYs.
The KSZ8873MML evaluation board is easy to use. There are programmable LED indicators for
link and activity on port 2 and a power LED. A manual reset button allows the user to reset the
board without removing the power plug. A standard 5VDC power supply is included so that the

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user can supply power from any 110-240 Volt AC wall or bench socket, and the power also can
be provided by USB port when close pin 2-3 of the JP44 jumper.
Figure 1: KSZ8873MML Evaluation Board Block Diagram
The KSZ8873MML evaluation board is easy to use. There are programmable LED indicators for
link and activity on the PHY port and a power LED. A manual reset button allows the user to
reset the board without removing the power plug. The 5V power on the board can be supplied by
a standard 5VDC power supply or by the USB cable (close pin 2-3 of JP44 jumper) which is used
to access the registers in SPI mode. The JP44 is used to select the power supply. A standard
5VDC power supply is included so that the user can supply power from any 110 Volt AC wall or
bench socket. Before to start to use the evaluation board, make sure the power connectors
JP103, JP104, JP105 and JP107 are connected, and close pin 1-2 of J14.
4.1 Strap In Mode
Strap in configuration mode is the quickest and easiest way to get started. In this mode, the
KSZ8873MML acts as a standalone 3-port switch. Simply set the board’s configuration jumpers
to the desired settings and apply power to the board. The configuration can be changed while
power is applied to the board by changing the jumper settings and pressing the convenient
manual reset button for the new settings to take effect. Note that even if no external strap in
values are set, internal pull up and pull down resistors will set the KSZ8873MML default
configuration. Section 4.1.1 covers each jumper on the board and describes its function. To

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start in strap in configuration mode, make sure that the USB cable is unplug, JP34 and JP35 ,
JP3 and JP9 are connected, JP21, JP25 have jumpers fitted between pins 2 to 3.
4.1.1 Feature Setting Jumpers
The evaluation board provides jumpers to allow easy setting of strap in configurations for the
KSZ8873MML. Table 1 describes the jumpers and their functionalities.
Table 1: Feature Setting Jumpers
JUMPER KSZ8873MML
SIGNAL
OPEN CLOSED
JP3 SPIQ SPI EEPROM
JP25 P2LED0 EEPROM/SPI Setting. See Section 4.2 and 4.3
JP21 P2LED1 EEPROM/SPI Setting. See Section 4.2 and 4.3
JP26 SMRXDV3 P3 MII Setting. Pull Up: PHY mode, Pull Down: MAC mode
JP27 SMRXD13 P1 MII Setting. Pull Up: PHY mode, Pull Down: MAC mode
JP78 FXSD1 Pins 1-2 closed : Force port 1 FX mode
Pins 5-6 closed : Force port 1 TX mode
For KSZ8873MML, close 5-6 since this device doesn’t
support FX mode.
JP2 PWRDN Normal Operation KSZ8873MML
Chip Power Down
JP30 P1FFC Pull Down = Disable
Pull Up(default) = Enable
JP46 P1DPX Pull Down = Half Duplex
Pull Up(default) = Full Duplex
JP31 P1SPD Pull Down = 10BT
Pull Up(default) = 100BT
JP32 P2FFC Pull Down = Disable
Pull Up(default) = Enable
JP47 P2DPX Pull Down = Half Duplex
Pull Up(default) = Full Duplex
JP33 P2SPD Pull Down = 10BT
Pull Up(default) = 100BT
JP33 P2ANEN Pull Down = Disable
Pull Up(default) = Enable
JP37 P3FFC Pull Down = Disable
Pull Up(default) = Enable
JP48 P3DPX Pull Down = Full Duplex
Pull Up(default) = Half Duplex
JP38 P3SPD Pull Down = 100BT
Pull Up(default) = 10BT
JP33 XCLK Pull Down = 50MHz
Pull Up(default) = 25MHz
Note: JP33, JP47 and JP32 are only valid if Auto-Negotiation is disabled.
The following table shows the recommended settings for the evaluation board reserved jumpers.

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Table 2: Reserved Jumpers
JUMPER Description Recommended Setting
JP79 MDC_PHY,MDIO_PHY Open
JP40 P3 MII configuration
(For test only)
Open
JP41 P1 MII configuration
(For test only)
Open
JP106 3.3V Biased of transformer
Center (For test only)
Open
JP11 Power for Fiber Module.
(KSZ8873MLL doesn’t
support Fiber mode)
Open
JP29 REFCLKO1 enable.
(Only for RMII interface.
(KSZ8873MLL doesn’t
support RMII interface)
Open
JP28 REFCLKO3 enable.
(Only for RMII interface.
(KSZ8873MLL doesn’t
support RMII interface)
Open
4.2 I2C Master (EEPROM) Mode
The evaluation board has an EEPROM to allow the user to explore more extensive
capabilities of the KSZ8873MML. The user can conveniently program the EEPROM on
board using the USB port from any computer with a WIN 2000/XP environment and the
Micrel provided software. This makes it easy for the user to evaluate features like
“broadcast storm protection” and “rate control”.
To prepare the KSZ8873MML evaluation board for EEPROM configuration follow these
steps:
1. Copy the Micrel provided EEPROM software to your computer.
2. Set JP3, JP9, JP21, JP25, JP34 and JP35 as specified in Table 3 for EEPROM mode
configuration. Make sure that the EEPROM is installed on the board.
3. Connect the computer’s USB port to the KSZ8873MML board with a USB port
cable.
4. There are two way to power up the evaluation board:
a). Connect the 5 VDC power supply to the KSZ8873MML when JP44 pin1-2 is
closed.
b). 5 VDC power source from the USB port when JP44 pin 2-3 is closed.
5. The KSZ8873MML will power up in its default configuration if there is no
information in the EEPROM.
6. Program the desired settings into the EEPROM using the Micrel software. See the
USB_SPI Software User’s Guide for details.

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7. Press the manual reset button. The KSZ8873MML will reset and read the new
configuration in the EEPROM. After reset, the KSZ8873MML is ready for normal
operation.
Table 3: EEPROM Mode Settings
Jumper Description Setting
JP9 SPIQ Closed
JP3 SCL_MDC_SW Closed
JP34 SCL_MDC Closed
JP35 SDA_MDIO Closed
JP25 Serial Bus Config. (P2LED0) Pins 2-3 closed
JP21 Serial Bus Config. (P2LED1) Pins 2-3 closed
4.3 SPI Slave Mode
From SPI interface to the KSZ8873MML, use a USB to SPI converter that allows
accessing all of the KSZ8873MML features and registers. The user can easily access the
SPI interface using a computer connected to the evaluation board’s USB port interface.
Micrel provides a Windows 2000/XP based program for the user to evaluate the
KSZ8873MML’s full feature set. In addition to all the registers available via EEPROM
programming, a host CPU connected to the KSZ8873MML’s SPI interface will be able to
access all static MAC entries, the VLAN table, dynamic MAC address table and the MIB
counters.
To prepare the KSZ8873MML evaluation board for SPI mode configuration follow
these steps:
1. Copy the Micrel provided SPI interface software on your computer.
2. Set JP3, JP9, JP21, JP25, JP34 and JP35 as specified in Table 4 for SPI mode
configuration.
Table 4: SPI Slave Mode Settings
Jumper Description Setting
JP9 SPIQ Open
JP3 SCL_MDC_SW Open
JP34 SCL_MDC Closed
JP35 SDA_MDIO Closed
JP25 Serial Bus Config. (P2LED0) Pins 2-3 closed
JP21 Serial Bus Config. (P2LED1) Pins 1-2 closed
3. Connect the computer’s USB port to the KSZ8873MML board with a USB port cable.
4. Remove the EEPROM from the evaluation board. (Optional)
5. There are two way to power up the evaluation board:
a). Connect the 5 VDC power supply to the KSZ8873MML when JP44 pin1-2 is

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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

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female MII port connector. This interface is normally used to connect the KSZ8873MML to an
external PHY, for example the Micrel KS8721B.
5.0 Reference Documents
KSZ8873MML Datasheet Rev. 1.0 (Contact Micrel for latest Datasheet)
KSZ8873MML Evaluation Board Schematic Rev. 1.0 (Contact Micrel for latest Schematic)
KSZ8873MML Evaluation Board Gerber files
MIC29302WT Datasheet (Datasheet available at www.micrel.com)
Micrel USBSPI73 Configuration Software v1.0

KSZ8873MML Evaluation Board User’s Guide
Micrel, Inc. January 11, 2011
Confidential Rev. 1.1
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