KS8993 Micrel KS8993 3-Port 10/100 Integrated Switch with PHY and Frame Buffer Rev. 2.05 The KS8993 has rich features such as VLAN and priority General Description queuing and is designed to reside in an unmanaged design The KS8993 contains three 10/100 physical layer transceiv- not requiring processor intervention. This is achieved through ers, three MAC (Media Access Control) units with an inte- I/O strapping at system reset time. grated layer 2 switch. The device runs in two modes. The first On the media side, the KS8993 supports 10BaseT, mode is a three port integrated switch and the second is as 100BaseTX and 100BaseFX as specified by the IEEE 802.3 a three port switch with the third port decoupled from the committee. physical port. In this mode access to the third MAC is provided Physical signal transmission and reception are enhanced using a reverse or forward MII (Media Independent Interface) through use of analog circuitry that makes the design more such that an external MAC can be directly connected to the efficient and allows for lower power consumption and smaller KS8993. This interface also supports the 7-wire (serial net- chip die size. work interface) as used by some routing devices. Data sheets and support documentation can be found on Useful configurations include a stand alone three port switch Micrels web site at www.micrel.com. 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. Functional Diagram Look-Up SRAM Queue Buffer Engine Buffers Management Management (1K Entries) (16Kx32) FIFO and Flow Control MRXD 3:0 MRXDV MAC MAC MAC MCOL 1 2 3 MCRS M MRXCLK I I MTXD 3:0 MTXEN MTXER MII / SNI MTXCLK (exclusive) MCOLIN External MRXD 0 Interface MRXDV Physical Physical Physical MCOL S Transceiver Transceiver Transceiver MRXCLK N 1 2 3 I MTXD 0 MTXEN MTXCLK LED LED 1 3:0 and LED 2 3:0 Programming LED 3 3:0 Interface Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 KS8993 Micrel Features Ordering Information 3-port 10/100 integrated switch with physical layer Part Number Temperature transceivers Package Range Standard Pb-Free 64k Byte of SRAM on chip for frame buffering KS8993 KSZ8993 0C to +70C 128-Pin PQFP 1.0Gbps high performance memory bandwidth 10BaseT, 100BaseTX and 100BaseFX modes of KS8993I 40C to +85C 128-Pin PQFP 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 port- based 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 auto- negotiation 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: 0C to +70C Industrial temperature range: 40C to +85C Available in 128-pin PQFP with single 2.5V power supply KS8993 2 May 2005