General Description
The DM9103 is a fully integrated, high performance, and cost-effective fast Ethernet switch controller with one general PCI bus interface, two ports 10M/100Mbps PHY, and one port MII or RMII interface. The general PCI bus connects directly to internal host MAC with 32-bit data registers and internal memory. The host MAC has the similar functions as other 10/100Mbps PHY or MII does. This makes the DM9103 act as an extended four ports
switch and to shorten the latency from PCI port to destination port.

FEATUREs
Ethernet Switch with two 10/100Mb PHY, one MII/RMII, and PCI bus interface
Support Reverse-MII
PCI bus master architecture
EEPROM interface for power up configurations
Support TCP/UDP/IPv4 checksum offload
Support HP Auto-MDIX
Support IEEE 802.3x Flow Control in Full-duplex mode
Support Back Pressure Flow Control in Half-duplex mode
Per port support 4 priority queues by Port-based, 802.1P QoS, and IP TOS priority
Support 802.1Q VLAN up-to 16 VLAN group
Support VLAN ID tag/untag options
Per port support bandwidth, ingress and egress rate control
Support Broadcast Storming filter function
Support Store and Forward switching approach
Support up-to 1K Uni-cast MAC addresses
Automatic aging scheme
Support MIB counters for diagnostic
128-pin LQFP 1.8V internal core, 3.3V I/O with 5V tolerant