General Description:

The KSZ8999 contains eight 10/100 physical layer transceivers, nine Media Access Control (MAC) units with an integrated layer 2 switch. The device runs in two modes. The first mode is an eight-port integrated switch and the second

is as a nine-port switch with the ninth port available through a Media Independent Interface (MII). Useful configurations

include a stand alone eight-port switch as well as an eight-port switch with a routing element connected to the extra MII

port. The additional port is also useful for a public network interfacing. The KSZ8999 is designed to reside in an unmanaged design that does not require processor intervention.

This is achieved through I/O strapping or EEPROM programming at system reset time. On the media side, the KSZ8999

supports 10BASE-T, 100BASE-TX, and 100BASE-FX, as specified by the IEEE 802.3 committee. Physical signal transmission and reception are enhanced through the use of analog circuitry that makes the design more efficient and allows

for lower power consumption and smaller chip die size.

Features:

• Nine port (8+1) 10/100 Integrated Switch withEight Physical Layer Transceivers and One MII/SNI Interface

• Advanced Ethernet Switch with Internal FrameBuffer

- 128K Byte of SRAM on Chip for Frame Buffering

- 2.0 Gbps High Performance Memory Bandwidth

- Wire Speed Reception and Transmission

- Integrated Address Lookup Engine, Supports1K Absolute MAC Addresses

- Automatic Addressing Learning, AddressAging, and Address Migration

• Advanced Switch Features

- Supports 802.1p Priority and Port-Based Priority

- Supports Port-Based VLAN

- Supports 1536 byte Frame for VLAN Tag- Supports DiffServ Priority, 802.1p Based Priority or Port-Based Priority or BroadcastStorm Protection

• Proven Transceiver Technology for UTP and FiberOperation

- 10BASE-T, 100BASE-TX, and 100BASE-FXModes of Operation

- Supports for UTP or Fiber on All Eight Ports

- Indicators for Link, Activity, Full-/Half-Duplex,and Speed

- Hardware-Based 10/100, Full/Half, FlowControl and Auto-Negotiation

- Individual Port Forced Modes (Full-Duplex,100BASE-TX) when Auto-Negotiation is Disabled

- Full-Duplex IEEE 802.3x Flow Control

- Half-Duplex Back Pressure Flow Control

• Supports MDI/MDI-X Auto Crossover

• External MAC Interface (MII or 7-Wire) for RouterApplications

• Unmanaged Operation via Strapping or EEPROMat System Reset Time (see Reset Reference Circuit Section)

• Comprehensive LED Support

• Single 2.0V (min.), 2.1V (typ.) Power Supply withOptions for 2.5V and 3.3V I/O

• 900 mA (1.80W) Including Physical Transmit Drivers

• Supports Commercial and Industrial TemperatureRanges

- Commercial Temperature Range: 0°C to+70°C (KSZ8999)

- Industrial Temperature Range: –40°C to+85°C (KSZ8999I)

• Available in a 208-Lead PQFP Package