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SMSC LAN9303M
USER MANUAL
Revision 1.0 (05-28-09)
LAN9303M Evaluation Board User Manual
1 Introduction
The LAN9303M is a full featured, three-port 10/100 managed Ethernet switch designed for embedded
applications where performance, flexibility, ease of integration and system cost control are required.
The LAN9303M combines all the functions of a 10/100 Ethernet switch system, including the Switch
Fabric, packet buffers, Buffer Manger, MACs, PHY transceivers, and serial management. The
LAN9303M complies with the IEEE 802.3 (full/half-duplex 10BASE-T and 100BASE-TX) Ethernet
protocol specification and 802.1D/802.1Q management protocol specifications, enabling compatibility
with industry standard Ethernet and Fast Ethernet applications.
The EVB9303M is an Evaluation Board (EVB) that utilizes the LAN9303M to provide a fully functional
three-port dual MII/RMII/Turbo MII Ethernet switch. The EVB9303M provides two fully integrated
MAC/PHY Ethernet ports (Ports 1 & 2) via on-board RJ45 connectors. Port 0 and Port 1 each provide
two MII port connectors (for a total of 4) which support the following:
An external MII-/RMII-/Turbo MII-capable MAC (with LAN9303M in PHY mode), via the onboard
40-pin male MII connector
An external MII-/Turbo MII-capable PHY (with LAN9303M in MAC mode), via the onboard 40-pin
female MII connector
The Port 0 and Port 1 modes of operation are configured via a single, 8-position, mode-configuration
strap switch.
Power is supplied to the board via a +5V external wall-mount power supply. The external supply is not
necessary when Port 0 or Port 1 is configured for (and used in) PHY mode. In such cases, the +5V
power rail is typically supplied through the MII connector from the MAC side.
The EVB9303M includes a 8Kx8 I
2
C EEPROM that may be used to automatically load configuration
settings from the EEPROM into the device at reset, allowing the device to operate unmanaged. An I
2
C
host adapter interface header (10-pin, 2x5) is provided to simplify I
2
C based configuration. A simplified
block diagram of the EVB9303M can be seen in
Figure 1.1.
To
external
MAC
40-Pin MII
Connector
(Male)
Jumper
I C Host
Adapter I/F
2
8K x 8
I
2
C
EEPROM
To
external
PHY
40-Pin MII
Connector
(Female)
Port0
Port2
10/100
Ethernet
Magnetics &
RJ45
Ethernet
To
external
MAC
SMSC
LAN9303M
40-Pin MII
Connector
(Male)
Port1
Configurable
Port1
10/100
Ethernet
Magnetics &
RJ45
Ethernet
To
external
PHY
40-Pin MII
Connector
(Female)
Mode Switch
EVB9303M
Figure 1.1 EVB9303M Block Diagram
Revision 1.0 (05-28-09)
USER MANUAL
2
SMSC LAN9303M
LAN9303M Evaluation Board User Manual
1.1
References
Concepts and material available in the following documents may be helpful when using the EVB9303M.
Table 1.1 References
DOCUMENT
LOCATION
http://www.smsc.com/main/datasheet.html
http://www.smsc.com/main/appnotes.html
http://www.smsc.com/
SMSC LAN9303M Datasheet
AN8-13 Suggested Magnetics
SMSC EVB9303M Evaluation Board Schematic
2 Board Details
The following sections describe the various board features, including jumpers, LEDs, test points,
system connections, and switches. A top view of the EVB9303M is shown in
Figure 2.1.
Note:
The LAN9303M device is RoHS compliant. However, support components on the EVB9303M
board are not necessarily RoHS compliant.
JP3
JP1
JP2
Power Switch
Port 0
MII Connector
(Female)
+5V Power
Input
Fuse
Port 0
MII Connector
(Male)
(with integrated
magnetics & LEDs)
Eth. Port 2
Mode
Switches
SMSC
LAN9303M
Eth. Port 1
(with integrated
magnetics & LEDs)
Port 1
MII Connector
(Male)
JP4-JP18
I
2
C Host
Adapter I/F
Reset Switch
Figure 2.1 EVB9303M Top View
Port 1
MII Connector
(Female)
SMSC LAN9303M
USER MANUAL
3
Revision 1.0 (05-28-09)
LAN9303M Evaluation Board User Manual
2.1
Jumpers
The following tables describe the default settings and jumper descriptions for the EVB9303M. These
defaults are the recommended configurations for evaluation of the LAN9303M. These settings may be
changed as needed, however, any deviation from the default settings should be approached with care
and knowledge of the schematics and datasheet. An incorrect jumper setting may disable the board.
Note:
A dashed line in the
Settings
column indicates the board’s default jumper setting.
2.1.1
JP1 - JP6
Table 2.1 Jumpers JP1 - JP6
JUMPER
JP1
DESCRIPTION
Connect +5V DC power
supply
1---2
1---2
JP2
Power switch enable jumper
2
3
SETTINGS
IN:
Connect +5V brick output to power
plane
OUT:
Disconnect +5V brick power
Enable power switch
Disable power switch, force power ON
always
IN:
Connect +3.3V regulator output to
+3.3V power plane
OUT:
Disconnect +3.3V regulator
Connect MDIO to 1.5K pull-up to +3.3V
Connect MDIO to 2.5K pull-down to GND
IN:
Connect MDC to 10K pull-down
OUT:
Disconnect MDC from 10K pull-
down
Pins 1 and 2 are +3.3V
Connect I
2
C EEPROM to SDA
Connect I
2
C EEPROM to SCL
Pins 7 and 8 are GND
JP3
Connect +3.3V jumper
1---2
1---2
2
3
JP4
MDIO pull-up/down jumper
JP5
MDC pull-down jumper
1---2
1
2
JP6
I
2
C connect jumper
3---4
5---6
7---8
2.1.2
JP7 - JP18
Jumpers JP7 through JP18 set various functions of the LAN9303M. They can also be used as GPIOs,
LED drivers, or interrupts. When used as LED drivers, as they are on the EVB9303M, they are
connected a specific way to set the strap value to a “1”, and another way to set the strap value to a
“0”.
Figure 2.2
illustrates the schematic connections with the LED1 circuit as a pull-up, and the LED2
circuit as a pull-down. To illuminate LED1, the LAN9303M will drive the cathode of the LED1 low. To
illuminated LED2, the LAN9303M will drive the anode of the LED2 high.
The JP7 - JP18 jumpers must be configured in pairs to identical settings in order to realize the LED1
circuit or the LED2 circuit. The pairings are as follows:
JP7 & JP13
JP8 & JP14
JP9 & JP15
JP10 & JP16
Revision 1.0 (05-28-09)
USER MANUAL
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SMSC LAN9303M
LAN9303M Evaluation Board User Manual
JP11 & JP17
JP12 & JP18
The following subsections detail the jumper pair settings, their associated strap settings, and the
functional effects of setting the straps. All strap values are read during power-up and on the rising edge
of the nRST signal. Once the strap value is set, the LAN9303M will drive the LEDs high or low for
illumination according the strap value. For other designs which may use these pins as GPIOs or
interrupts, refer to the LAN9303M datasheet for additional information. In those cases, internal default
straps must be changed by an I
2
C or SMI master or through EEPROM fields.
+3.3V
R1
332
1/10W
1%
Strap Pulldown
LED2
R3
10.0K
1/16W
1%
R2
10.0K
1/16W
1%
LED1
Strap Pullup
R4
332
1/16W
1%
Figure 2.2 LED Strap Circuit
2.1.2.1
Auto-MDIX / EEPROM Jumpers
Table 2.2 Jumpers - Auto-MDIX / EEPROM
JUMPER PAIR
JP7, JP13
DESCRIPTION
Port 1 Auto-MDIX
enable/disable (Note
2.1)
Port 2 Auto-MDIX
enable/disable (Note
2.1)
EEPROM size jumper
(Note
2.1, Note 2.2)
1---2
2
3
SETTINGS
Enable Auto-MDIX on Port 1
Disable Auto-MDIX on Port 1
Enable Auto-MDIX on Port 2
Disable Auto-MDIX on Port 2
Enable 4Kx8 and larger I
2
C EEPROMs
Enable 2Kx8 and smaller I
2
C EEPROMs
JP8, JP14
1---2
2
3
JP9, JP15
1---2
2
3
Note 2.1
Note 2.2
Paired jumpers
MUST
be set identically.
The EVB9303M uses an 8Kx8 EEPROM. Therefore, this jumper
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