Ethernet Switch 3-Port 10Mbps/100Mbps

The KS8993 contains three 10/100 physical layer transceivers, three MAC (Media Access Control) units with an integrated layer 2 switch. The device runs in two modes. The first mode is a three port integrated switch and the second is as a three port switch with the third port decoupled from the physical port. In this mode access to the third MAC is provided using a reverse or forward MII (Media Independent Interface) such that an external MAC can be directly connected to the KS8993. This interface also supports the 7-wire (serial network interface) as used by some routing devices. Useful configurations include a stand alone three port switch as well as a two port switch with a routing element connected to the extra MII port. The additional port is also useful for public network interfacing. The KS8993 has rich features such as VLAN and priority queuing and is designed to reside in an unmanaged design not requiring processor intervention. This is achieved through I/O strapping at system reset time. On the media side, the KS8993 supports 10BaseT, 100BaseTX and 100BaseFX as specified by the IEEE 802.3 committee. Physical signal transmission and reception are enhanced through use of analog circuitry that makes the design more efficient and allows for lower power consumption and smaller chip die size. 3-port 10/100 integrated switch with physical layer transceivers 64k Byte of SRAM on chip for frame buffering 1.0Gbps high performance memory bandwidth 10BaseT, 100BaseTX and 100BaseFX modes of operation Support for UTP or fiber installations Superior analog technology for reduced power and die size Supports port based VLAN QoS feature Supports 802.1p based priority or portbased priority Indicators for link, activity, full/half-duplex and speed Unmanaged operation via strapping at system reset time Hardware based 10/100, full/half, flow control and autonegotiation Individual port forced modes (full-duplex, 100BaseTX) when auto-negotiation is disabled Wire speed reception and transmission On chip integrated address look-up engine, supports 1K absolute MAC addresses Automatic address learning, address aging and address migration Full-duplex IEEE 802.3x flow control (Pause) with force mode option Half-duplex back pressure flow control Comprehensive LED support External MAC interface (MII or SNI 7-wire ) for router applications 300mA (0.75W) including physical transmit drivers Commercial temperature range: 0°C to +70°C Available in 128-pin PQFP with single 2.5V power supply