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LD9004
4-port 10/100/1000Mbps Layer 2 Ethernet Switch
Version 1.0
DESCRIPTION
This Layer 2 Switch provides an ideal solution for the design of unmanaged full wire-speed
multi-port Gigabit Ethernet (GbE) switches. Each port supports either 10/100/1000Mbps data
rate. Flow controls, backpressure in half duplex mode and PAUSE frame in full duplex mode are
employed to solve the HOL (Head of Line) blocking.
This Layer 2 Switch integrates four half/full duplex mode 1000BASE Gigabit Ethernet MACs,
wire speed switching engines, MAC address based Address Parsing Algorithm, Packet buffer
memory.
FEATURES
• Supports four 10/100/1000 Mbps Ethernet ports with GMII/MII interface.
• IEEE 802.3ab CSMA/CD Compliant
• Full and half duplex mode of operation.
• Speed and Duplex mode auto-negotiation through MDIO.
• Self address learning mechanism supports 512 MAC address.
• Automatic address aging with 300 seconds default.
• 1Mbit packet buffer memory embedded
• SPI interface employed to communicate with MCU.
• IEEE802.3ab flow control for full duplex operation.
• Supports Store-and-Forward mode of operation.
• 0.18 micron, 1.8V CMOS technology packaged in 160-pin PQFP.
• 3.3V I/O.
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LD9004
4-port 10/100/1000Mbps Layer 2 Ethernet Switch
Version 1.0
Ethernet Level 2 Switch Block Diagram
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