BCM5208R
BCM5208R 10/100BASE-TX QUAD-FTM TRANSCEIVER
24-Port 10/100BASE-T Ethernet Switch Example
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
Switching
Engine
MAC
Logic
MP
Memory
Switch Module
MAC
MAC
MAC
MAC
MAC
MAC
MAC
BCM5208R
10/100BASE-TX
QUAD-
TM
Transceiver
BCM5208R
10/100BASE-TX
QUAD-
TM
Transceiver
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
F E A T U R E S
S U M M A R Y O F B E N E F I T S
O V E R V I E W
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
2004 by BROADCOM CORPORATION. All rights reserved.
5208R-PB03-R
04/01/04
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.
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 industry-
standard 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.
TD+/-{1:4}
CK25
BIAS
JTAG
MDC
MDIO
TXD[3:0] {1:4}
TXEN {1:4}
TXER{1:4}
TXC
COL/RXEN {1:4}
RXC {1:4}
CRS {1:4}
RXDV {1:4}
RXD[3:0] {1:4}
LNKLED {1:4}
COLLED {1:4}
100LED {1:4}
FDXLED {1:4}
RXER {1:4}
XMTLED {1:4}
RCVLED {1:4}
MODES
RD+/-{1:4}
S/H
ADC
CRS/Link
Detection
MII
Registers
Bias
Generator
JTAG
TAP+BS
Clock
Recovery
Multimode
TX DAC
Baseline
Wander
Correction
10BASE-T
PCS
100BASE-T
PCS
LED
Drivers
MII
Mgmt
Control
8
8
3
5
16
4
4
4
4
4
4
4
16
4
4
4
4
4
4
20
Clock
Generator
Digital
Adaptive
Equalizer
Auto-
Negotiation/
Link Integrity
PDF 
ZIP