BCM5208R
®
BCM5208R 10/100BASE-TX QUAD-F™ TRANSCEIVER
SUMMARY OF BENEFITS
FEATURES
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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
• Fully integrated TX quad PHY transceiver (MII to TX
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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-ΦTM
Transceiver
MAC
MAC
MAC
Switching
Engine
Switch Module
MP
MAC
BCM5208R
10/100BASE-TX
QUAD-ΦTM
Transceiver
MAC
MAC
MAC
24-Port 10/100BASE-T Ethernet Switch Example
Memory
Logic
OVERVIEW
16
Multimode
TX DAC
TD+/-{1:4}
8
4
4
10BASE-T
PCS
Baseline
Wander
Correction
RD+/-{1:4}
8
S/H
ADC
TXD[3:0] {1:4}
TXEN {1:4}
TXER{1:4}
TXC
100BASE-T
PCS
4
COL/RXEN {1:4}
4
RXC {1:4}
4
Digital
Adaptive
Equalizer
CRS {1:4}
4
RXDV {1:4}
4
RXER {1:4}
RXD[3:0] {1:4}
16
AutoNegotiation/
Link Integrity
CRS/Link
Detection
4
4
LED
Drivers
4
4
Clock
Generator
CK25
BIAS
JTAG
4
Clock
Recovery
4
Bias
Generator
3
JTAG
TAP+BS
5
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.
20
MII
Registers
MII
Mgmt
Control
LNKLED {1:4}
COLLED {1:4}
100LED {1:4}
FDXLED {1:4}
XMTLED {1:4}
RCVLED {1:4}
MODES
MDC
MDIO
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®, 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.
5208R-PB03-R
04/01/04
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: [email protected]
Web: www.broadcom.com