BCM5461
®
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, RTBI, and MII MAC Interface options
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
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%).
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Clock timing can be adjusted to eliminate board trace delays
required by the RGMII specification.
Provides interoperability with IEEE standard devices operating at 10,
100, and 1000 Mbps at half- and full-duplex.
Lowers system BOM cost and simplifies system design.
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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Transformer
RJ-45
Main Control Board
Peripheral Board #1
Peripheral Board #2
BCM5464
BCM5461
BCM5645
24FE+2G
Switch
Transformer
RJ-45
BCM5461
BCM5461
BCM5461
BCM5248
Octal
10/100 Mbps PHY
BCM5248
Octal
10/100 Mbps PHY
BCM5248
Octal
10/100 Mbps PHY
Gigabit Backplane Communication
1000BASE-T Gigabit Uplink
OVERVIEW
BCM5461
TX DAC
Symbol
Encoder
TXD[7:0]
TX_EN
TX_ER
GTX_CLK
TX_CLK
16
Gain
Automatic
Control
TRD [3:0]+
Echo
Canceller
XTALK
Canceller
X3
COL
CRS
PGA
ADC
FFE
DFE/
Trellis
Decoder
Symbol
Decoder/
Aligner
RX_CLK
RX_DV
RX_ER
RXD[7:0]
Auto-
Negotiation
XTALI
XTALO
Timing &
Phase
Recovery
Clock
Generator
Bias
Generator
MII
Registers
MII
MGMT
Control
MDC
MDIO
INTR
RDAC {1:2}*
Modes
BCM5461 Reference Design
Gigabit Ethernet transceiver. The BCM5461 is 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
BCM5461 enables a new class of cost-effective Gigabit Ethernet
equipment, driving the delivery of Gigabit bandwidth to the desktop.
The BCM5461’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 BCM5461
architecture not only 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 BCM5461 has the industry's lowest power. For NIC
applications, support for Wake on LAN enables compliance with PCI 2.2
and PC99/PC2000. Also, the BCM5461 has extremely low EMI emissions,
which reduces the design constraints required to meet EMI emissions
specifications.
In addition to supporting the IEEE 802.3 Standard Gigabit Media
Independent Interface (GMII), the BCM5461 also supports the RGMII and
RTBI interfaces. RGMII is a reduced pin-count (12 versus 25) version of
the GMII, and RTBI is a reduced pin-count version of TBI utilizing
standard ASIC technology. The small package, multiple MAC interfaces,
and streamlined power supply lowers system cost and simplifies the system
and board level design.
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 offers 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 BCM5461 incorporates a number of advanced features. The link
quality indicator LED provides installers with immediate visual
notification of any problems with the wiring plant supporting operation at
the desired speed. This includes physical wiring defects that the BCM5461
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 first-level diagnostics and fault isolation.
The BCM5461 also has ESD tolerance that exceeds typical industry
standards. This prevents ESD damage not only during manufacturing but
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-PB05-R
04/17/06
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
Embedded System
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