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BCM5238
(R)
10/100BASE-TX OCTAL-TM TRANSCEIVER
FEATURES * * * * * * * * * * * * *
Single-chip, eight-port Fast Ethernet transceiver Low-power 1.8V CMOS technology Serial Media Independent Interface (SMII) Source Synchronous SMII (SSSMII) HP Auto-MDIX automatic crossover Supports 10BASE-T Polarity Correction Compatible with 2.5V I/O and 3.3V I/O Fully integrated digital adaptive equalization Up to 150 meters of error-free operation Full-duplex support Interrupt output capability 128-pin PQFP or 256-ball BGA package Proven Broadcom proprietary all-DSP Digi-TM architecture
SUMMARY OF BENEFITS * Target usage: Fast Ethernet switches. * Lowest per port power solution available:< 215 milliwatts per
port.
* Smallest footprint per port available. * Measures 14 mm 20 mm for eight ports. * Single-chip device contains eight independent Fast Ethernet
transceivers.
* Performs all physical layer interface functions for 100BASETX full-duplex or half-duplex Ethernet on Category 5 unshielded twisted-pair (UTP) cable and 10BASE-T full or half-duplex Ethernet on Category 3, 4, or 5 UTP cable. * Compliant with IEEE 802.3 standard. * IEEE 1149.1 (JTAG) scan chain support. * Two LED indicator pins per port.
BCM5421 Gigabit PHY
BCM5421 Gigabit PHY
BCM5238
OCTAL-
SMII
Quad Magnetics Quad Magnetics Quad Magnetics
BCM5238
OCTAL-
24-Port 10/100BASE-T Ethernet Switch Example
SMII
Quad Magnetics Quad Magnetics
BCM5238
OCTAL-
SMII
Quad Magnetics
OVERVIEW
TXD [3:0] 4 TD+/Multimode Xmt DAC 10BASE-T PCS Auto-MDIX TXEN TXER TXC 8 TXD{1:8} SSYNC SSMII_TXC
COL RXC 100BASE-X PCS Digital Adaptive Equalizer CRS RXDV RXER RXD[3:0] 4
MII to SMII
8
SSMII_RSYNC SSMII_RXC RXD{1:8}
RD+/-
ADC
AutoNegotiation/ Link Integrity LED Controller Clock Generator Clock Recovery DTE Power Detection 2
INTR/SLED_DO LED1{1:8} LED2{1:8} 2 S3MII_DIS/SLED_CLK
RFF_CLK
BIAS
Bias Generator
MDC
JTAG 5
JTAG TAP+BS
MII Registrers
MII Mgmt Control
MDIO
The Broadcom BCM5238 is a single-chip device containing eight independent Fast Ethernet transceivers. Each performs all the physical layer functions for 100BASE-TX full- or half-duplex Ethernet on Category 5 UTP cable and 10BASE-T full- or half-duplex Ethernet on Category 3, 4, or 5 UTP cable. The BCM5238 chip performs encoding and decoding, clock and data recovery, digital adaptive equalization, line transmission, carrier sense and link integrity monitoring, autonegotiation and RMII/SMII management functions. The BCM5238 is compliant with the IEEE 802.3 standard. The BCM5238 can be connected to a switch controller through the SMII or SSSMII on one side and to the network media on the other side
through isolation transformers. The BCM5238 operates from 1.8 and 2.5V/3.3V power supplies; the I/O operates at either 2.5V or 3.3V. The BCM5238 includes support for HP Auto-MDIX, which enables the transceiver to automatically detect and correct miswired cable. With the HP Auto-MDIX feature, all ports on a switch can be connected to any other 10/100 port on any switch, hub, or network interface card, using crossover or straight-through cables interchangeably. This makes installation, debugging, and maintenance of the network simpler and less expensive to the end user. The BCM5238 is offered in a 128-pin PQFP or 256-ball BGA package and supports two LED indicators per port.
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. 5238-PB07-R 07/19/04
Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com

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