LAN89303AM SMSC, LAN89303AM Datasheet - Page 3

• Manufacturer Part Number: LAN89303AM
• Description: Ethernet ICs High Perform 3-Port 10/100 Ether Switch
• Manufacturer: SMSC

Specifications of LAN89303AM

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Switches
• Standard Supported: IEEE802.1D, IEEE802.1Q
• Data Rate: 200 Mbps
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 85 C
• Package / Case: QFN-56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Three Port 10/100 Managed Ethernet Switch with MII/RMII for Automotive Applications
General Description
SMSC LAN89303AM
The LAN89303AM 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 LAN89303AM combines all the functions of a 10/100 switch system, including the switch
fabric, packet buffers, buffer manager, Media Access Controllers (MACs), PHY transceivers, and serial
management. The LAN89303AM complies with the IEEE 802.3 (full/half-duplex 10BASE-T and
100BASE-TX) Ethernet protocol specification and 802.1D/802.1Q network management protocol
specifications, enabling compatibility with industry standard Ethernet and Fast Ethernet applications.
At the core of the device is the high performance, high efficiency three port Ethernet switch fabric. The
switch fabric contains a three port VLAN layer-2 switch engine that supports untagged, VLAN tagged,
and priority tagged frames. The switch fabric provides an extensive feature set which includes
spanning tree protocol support, multicast packet filtering and Quality of Service (QoS) packet
prioritization by VLAN tag, destination address, port default value or DIFFSERV/TOS, allowing for a
range of prioritization implementations. 32k of buffer RAM allows for the storage of multiple packets
while forwarding operations are completed, and a 512 entry forwarding table provides ample room for
MAC address forwarding tables. Each port is allocated to a cluster of four dynamic QoS queues which
allow each queue size to grow and shrink with traffic, effectively utilizing all available memory. This
memory is managed dynamically via the buffer manager block within the switch fabric. All aspects of
the switch fabric are managed via the switch fabric configuration and status registers, which are
indirectly accessible via the system control and status registers.
The LAN89303AM provides three switched ports. Each port is fully compliant with the IEEE 802.3
standard and all internal MACs and PHYs support full/half duplex 10BASE-T and 100BASE-TX
operation. The LAN89303AM provides two on-chip PHYs, one virtual PHY and three MACs. The virtual
PHY and the third MAC are used to connect the switch fabric to an external MAC or PHY. In MAC
mode, the device can be connected to an external PHY via the MII/Turbo MII interface. In PHY mode,
the device can be connected to an external MAC via the MII/RMII/Turbo MII interface. All ports support
automatic or manual full duplex flow control or half duplex back pressure (forced collision) flow control.
2k jumbo-packet (2048 byte) support allows for oversized packet transfers, effectively increasing
throughput while decreasing CPU load. All MAC and PHY-related settings are fully configurable via
their respective registers within the device.
The integrated I
integrated I
flexibility in the incorporation of the device into various designs. It is this flexibility which allows the
device to operate in two different modes and under various management conditions. In both MAC and
PHY modes, the device can be SMI managed or I
the LAN89303AM a candidate for virtually all switch applications.
The LAN89303AM contains an I
This allows for the storage and retrieval of static data. The internal EEPROM loader can be optionally
configured to automatically load stored configuration settings from the EEPROM into the device at
reset. The I
In addition to the primary functionality described above, the LAN89303AM provides additional features
designed for extended functionality. These include a configurable 16-bit General Purpose Timer (GPT),
a 32-bit 25 MHz free running counter, and 6-bit configurable GPIO/LED interface.
The LAN89303AM’s performance, features and small size make it an ideal solution for many
applications in the automotive market. Targeted applications include interfaces for diagnostics, gateway
services, in-vehicle engineering development, manufacture testing, and legislated inspections.
2
2
C management slave and master EEPROM controller share common pins.
C or MII interface, respectively. The inclusion of these interfaces allows for greater
2
C and SMI slave controllers allow for full serial management of the device via the
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C master EEPROM controller for connection to an optional EEPROM.
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C managed. This flexibility in management makes
Revision 1.0 (10-05-09)