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| BCM5208R (R) BCM5208R 10/100BASE-TX QUAD-FTM TRANSCEIVER FEATURES * * * * * * * * * * * * * * 10BASE-T/100BASE-TX IEEE 802.3u-compliant Full-duplex support in all modes IEEE 802.3u-compliant auto-negotiation Media Independent Interface (MII) for each port Shared MII serial management interface Fully integrated digital adaptive equalizers 125-MHz clock generator and timing recovery Integrated multimode transmit wave shaping Integrated baseline wander correction LED status pins Loopback mode for diagnostics IEEE 1149.1 (JTAG) support 3.3V power supply 208-pin PQFP package SUMMARY OF BENEFITS * Fully integrated TX quad PHY transceiver (MII to TX magnetics optics) * Decreases system cost per port * Simplifies system and board design * Reduces power consumption On-chip multimode transmit wave shaping * Eliminates need for external filters * Minimizes EMI Flexible Ethernet PHY solution * 10BASE-T, 100BASE-TX full-duplex * Suited for Ethernet switch products Digital adaptive equalization and clock recovery * Increases SNR by 3 dB over ideal analog equalizers * Robust performance in harsh noise environments and over substandard cable * Immune to on-chip noise and crosstalk * Insensitive to variations in process, temperature, and voltage Cost reduction for BCM5208 designs * * * * MAC BCM5208R 10/100BASE-TX QUAD-TM Transceiver MAC MAC MAC Switching Engine Switch Module MP MAC Memory Logic BCM5208R 10/100BASE-TX QUAD-TM Transceiver MAC MAC MAC 24-Port 10/100BASE-T Ethernet Switch Example OVERVIEW 16 TD+/-{1:4} TXD[3:0] {1:4} TXEN {1:4} TXER{1:4} TXC 8 Multimode TX DAC Baseline Wander Correction 10BASE-T PCS 4 4 4 COL/RXEN {1:4} RXC {1:4} CRS {1:4} RXDV {1:4} RXER {1:4} RXD[3:0] {1:4} 100BASE-T PCS Digital Adaptive Equalizer 4 4 4 4 4 4 16 RD+/-{1:4} 8 S/H ADC CRS/Link Detection AutoNegotiation/ Link Integrity LNKLED {1:4} COLLED {1:4} 100LED {1:4} FDXLED {1:4} XMTLED {1:4} RCVLED {1:4} LED Drivers 4 4 4 4 CK25 Clock Generator Bias Generator JTAG TAP+BS Clock Recovery BIAS 3 5 20 MODES MDC MDIO JTAG MII Registers MII Mgmt Control The BCM5208R is a monolithic CMOS integrated circuit containing 4 transceivers that each perform all of the physical layer interface functions for 10BASE-T Ethernet on Category 3, 4, 5 unshielded twisted-pair (UTP) cable and 100BASE-TX Ethernet on Category 5 UTP cable. The BCM5208R employs the use of digital signal processing and full custom circuit design techniques to create a highly integrated and robust physical layer solution for Fast Ethernet switches. It complies fully with the IEEE 802.3u physical layer Media Independent Interface (MII) and auto-negotiation subsections, providing compatibility with all industrystandard Fast Ethernet MAC chips. The BCM5208R chip performs all the 4B5B, MLT3, NRZI, and Manchester encoding and decoding; clock and data recovery; stream cipher scrambling/descrambling; digital adaptive equalization; line transmission; carrier sense; and link management functions. The BCM5208R can be connected to a MAC through the MII on one side, and directly to the network media on the other side (through isolation transformers for UTP mode). The BCM5208R is an easy cost-reduction path for 10/100 systems originally designed with the BCM5208. The BCM5208R is a lower power, lower cost alternative that can drop into most BCM5208 designs without any hardware change. Broadcom(R), the pulse logo, and Connecting everything(R) are trademarks of Broadcom Corporation and/ or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2004 by BROADCOM CORPORATION. All rights reserved. 5208R-PB03-R 04/01/04 Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com |
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