Product Descriptions
The BCM5228 is an octal 10/100BASE-TX/FX transceiver targeted at Fast Ethernet switches. The device contains eight full-duplex 10BASE-T/100BASETX/FX Fast Ethernet transceivers, each of which perform all of the physical layer interface functions for 10BASE-T Ethernet on Category 3, 4, or 5 unshielded twisted-pair (UTP) cable and 100BASE-TX Fast Ethernet on Category 5 UTP cable. The 100BASE-FX is supported at each port through the use of external fiberoptic transmit and receive devices.
The BCM5228 is a highly integrated solution combining digital adaptive equalizers, ADCs, phase locked loops, line drivers, encoders, decoders, and the required support circuitry into a single monolithic CMOS chip. The BCM5228 complies with the IEEE 802.3 specification, including the auto-negotiation subsections.
The effective use of digital technology in the BCM5228 design results in robust performance over a broad range of operating scenarios. Problems inherent to mixedsignal implementations (such as analog offset and onchip noise) are eliminated by employing field-proven digital adaptive equalization and digital clock recovery techniques.
Product Features
• 10BASE-T/100BASE-TX/FX IEEE 802.3u compliant
• Single-chip octal physical interface-RMII to magnetics
• Reduced Media Independent Interface (RMII)
• Option-Serial Media Independent Interface (SMII)
• Option-Source Synchronous SMII (S3MII)
• Fully integrated digital adaptive equalizers
• 125-MHz clock generator and timing recovery
• On-chip multimode transmit waveshaping
• Edge-rate control eliminates external filters
• Integrated baseline wander correction
• HP Auto-MDIX
• Cable length indication
• Cable noise level indication
• IEEE 802.3υ-compliant auto-negotiation
• Shared MII management interface up to 25 Mbps
• Serial LED status pins
• Programmable parallel LED pins
• Interrupt output capability
• Loopback mode for diagnostics
• IEEE 1149.1 (JTAG) and NAND chain ICT support
• Low-power, dual-supply 2.5V/3.3V CMOS technology
• Compatible with 2.5V/3.3V I/O
• 208-pin PQFP and 256-pin FPBGA packages
Product Applications
• Fast Ethernet switches
Product Photos
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