OVERVIEW
®
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
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BROADCOM CORPORATION
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Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
5461-PB05-R 04/17/06
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owners.
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.
INTR
MDIO
MDC
TX DAC
TRD [3:0]+
XTALI
XTALO
RDAC {1:2}*
16
PGA ADC FFE
MII
MGMT
Control
MII
Registers
Modes
RXD[7:0]
RX_ER
RX_DV
RX_CLK
CRS
COL
TX_CLK
GTX_CLK
TX_ER
TX_EN
TXD[7:0]
Auto-
Negotiation
Clock
Generator
Bias
Generator
Symbol
Encoder
Symbol
Decoder/
Aligner
Timing &
Phase
Recovery
DFE/
Trellis
Decoder
XTALK
Canceller
X3
Echo
Canceller
Gain
Automatic
Control
BCM5461
