BCM5238
®
10/100BASE-TX OCTAL-Φ™ TRANSCEIVER
SUMMARY OF BENEFITS
FEATURES
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• Target usage: Fast Ethernet switches.
• Lowest per port power solution available:< 215 milliwatts per
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-Φ™ architecture
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
SMII
SMII
SMII
BCM5238
BCM5238
BCM5238
OCTAL-Φ
OCTAL-Φ
OCTAL-Φ
Quad
Magnetics
Quad
Magnetics
Quad
Magnetics
Quad
Magnetics
Quad
Magnetics
Quad
Magnetics
24-Port 10/100BASE-T Ethernet Switch Example
OVERVIEW
TXD [3:0]
4
TXEN
TXER
Multimode
Xmt DAC
TD+/-
8
SSYNC
10BASE-T
PCS
Auto-MDIX
TXC
SSMII_TXC
MII
to
SMII
COL
RXC
100BASE-X
PCS
RD+/-
ADC
TXD{1:8}
SSMII_RSYNC
SSMII_RXC
8
RXD{1:8}
CRS
RXDV
Digital
Adaptive
Equalizer
RXER
RXD[3:0]
4
AutoNegotiation/
Link Integrity
INTR/SLED_DO
LED1{1:8}
LED
Controller
RFF_CLK
Clock
Generator
BIAS
Bias
Generator
JTAG
TAP+BS
JTAG
5
Clock
Recovery
2
LED2{1:8}
2
DTE Power
Detection
S3MII_DIS/SLED_CLK
MDC
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®, the pulse logo, and Connecting everything® 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.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
5238-PB07-R
07/19/04
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: [email protected]
Web: www.broadcom.com