3-port 10/100 Integrated Switch With Phy And Frame Buffer - Micrel Semiconductor

The KS8993 contains three 10/100 physical layer transceiv- ers, three MAC (Media Access Control) units with an inte- grated 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 net- work 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. By Micrel Semiconductor