BCM5461S
®
10/100/1000BASE-T GIGABIT COPPER TRANSCEIVER
FEATURES
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Fully-integrated 10BASE-T/100BASE-TX/1000BASE-T Gigabit
Ethernet transceiver
GMII, RGMII, SGMII, SerDes, RTBI and MII MAC Interface options
Line-side copper and fiber interfaces
On-chip low-voltage regulators
Fully compliant with IEEE 802.3, 802.3u, and 802.3ab standards
0.13µ CMOS — low power and cost
Low power
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Less than 700 mW per port
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Wake on LAN support
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Advanced power management
Trace matched output impedance
Line-side loopback
Low EMI emissions
Cable plant diagnostic
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Cable plant analyzer function detects cable plant impairments
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Link quality indication LED
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Automatic detection and correction of wiring pair swaps, pair skew,
and pair polarity
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Automatic MDI/MDIX crossover at all speeds
Robust CESD tolerance
Support for jumbo packets up to 9 KB
IEEE 1149.1 (JTAG) boundary scan
128-pin MQFP, 117-pin BGA, and 100-pin FBGA packages
10/100/100BASE-T SFP/GBIC Module
100BASE-T Gigabit Uplink
SUMMARY OF BENEFITS
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Simplifies system and board design.
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Reduced I/O pin requirements with RGMII (over 50%), SGMII
(over 75%), and SerDes (over 80%).
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Clock timing can be adjusted to eliminate board trace delays
required by the RGMII specification.
Flexibility for copper or fiber applications.
Lowers system BOM cost and simplifies system design.
Provides interoperability with IEEE standard devices operating at 10
Mbps, 100 Mbps, and 1000 Mbps at half- and full-duplex.
Requires no airflow or heatsink.
Provides compliance with PCI 2.2 and PC99/PC2000.
Eases system level debug.
Reduces system design constraints to meet EMI emissions standards.
Cable diagnostic function characterizes cable plant condition and
immediately indicates cabling issues.
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Prevents erroneous equipment return due to bad cable plants.
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Prevents manufacturing fall-out due to bad cable plants.
High CESD tolerance prevents equipment damage and return.
Operates with larger packets for wider range of packet protocol
support and improved efficiency.
Ease of manufacturing with JTAG support, simplified power supply,
and multiple MAC interfaces.
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SerDes
SFP Connector
Transformer
RJ-45
x2
BCM5646
BCM5461S
BCM5461S
Optical Module
Transformer
BCM5248
BCM5248
Octal
10/100 Mbps PHY
BCM5248
Octal
10/100 Mbps PHY
Switch/MAC
RJ-45
Octal
10/100 Mbps PHY
10/100/1000BASE-T SFP/GBIC Module
100BASE-T Gigabit Uplink
OVERVIEW
BCM5461S
8
TX DAC
Symbol
Encoder
TXD[7:0]
TX_EN
MUX
TX_ER
GTX_CLK
TX_CLK
TRD [0:3]+
SGIN
±
Gain
Automatic
Control
Echo
Canceller
XTALK
Canceller
X3
SerDes/
SGSMII
SCLK
±
SGOUT
±
COL
CRS
PGA
ADC
FFE
DFE/
Trellis
Decoder
Symbol
Decoder/
Aligner
RX_CLK
RX_DV
RX_ER
Auto-
Negotiation
XTALI
XTALO
Timing &
Phase
Recovery
LED
Drivers
8
RXD[7:0]
Link[2]
Link[1]
RCVLED
XMLED
Clock
Generator
Bias
Generator
MII
Registers
MII
MGMT
Control
FDXLED
MDC
MDIO
INTR
RDAC
Modes
BCM5461S Reference Design
The BCM5461S is a fully integrated 10/100/1000BASE-T Gigabit
Ethernet transceiver optimized for low power and small footprint size to
enable backplane and uplink applications. By lowering system cost and
reducing power dissipation by nearly 30%, the BCM5461S enables a new
class of cost-effective Gigabit Ethernet equipment, driving the delivery of
Gigabit bandwidth to the desktop.
The BCM5461S’s Digital Signal Processor based architecture and
advanced power management techniques combine to achieve robust and
low-power operation over the existing CAT 5 twisted-pair wiring. The
BCM5461S architecture also meets the requirements of 802.3, 802.3u, and
802.3ab, but maintains the industry’s highest level of margin over IEEE
requirements for Echo, NEXT, and FEXT. Low power is a key factor in
implementing Gigabit small form factor NICs and uplinks and, at less than
700 mW per port, the BCM5461S has the industry's lowest power
requirement. For NIC applications, support for Wake on LAN enables
compliance with PCI 2.2 and PC99/PC2000. Also, the BCM5461S has
extremely low EMI emissions, which reduces the design constraints
required to meet EMI emission specifications.
The BCM5461S supports GMII, RGMII, SGMII, SerDes, TBI, RTBI, and
MII MAC interfaces. A unique feature of the BCM5461S is its ability to
support both copper and fiber networks, with an integrated SerDes PHY
interface that can connect directly to a fiber-optic module. Switching
between copper and fiber media can be accomplished either automatically
or through software control. The BCM5461S monitors copper link and
fiber signal detect status and, based on priorities set at initialization,
automatically swaps either copper traffic or fiber traffic to the MAC/
switch.
This device is another member of Broadcom's 0.13µ Gigabit copper PHY
family, joining the BCM5404, BCM5414, BCM5421, BCM5421S,
BCM5424, BCM5434, BCM5464, and BCM5464S. The 0.13µm process is
the optimal process that offers the best performance, lowest cost, and
lowest power for Gigabit copper solutions. Further, devices based on the
0.13µ process offer an excellent long-term cost curve, enabling better cost
reduction over time compared to older technologies, without having to
redesign or requalify a new part.
The BCM5461S incorporates a number of advanced features. A link
quality indicator LED provides instant notification of any problems with
the wiring plant operating at the desired speed. This includes physical
wiring defects that the BCM5461S cannot automatically correct and
channel conditions such as excessive cable length, and return loss,
crosstalk, echo, and noise. Broadcom’s cable analyzer software can be used
with the device to provide remote management of the cable and a first level
of diagnostics and fault isolation.
The BCM5461S also has ESD tolerance that exceeds typical industry
standards. This prevents ESD damage during manufacturing and during
CESD events in the field. Cable-sourced electrostatic discharge (CESD) is
an ESD event that occurs when an electrically charged network cable is
plugged into a network port, an issue becoming more prevalent with
contemporary cable installations.
Broadcom
®
, the pulse logo,
Connecting everything
®
, and the Connecting everything logo are among
the trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries
and/or the EU. Any other trademarks or trade names mentioned are the property of their respective
owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
5461-PB06-R
04/17/06
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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