OVERVIEW
®
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
© 2006 by BROADCOM CORPORATION. All rights reserved.
5461-PB06-R 04/17/06
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.
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.
INTR
MDIO
MDC
TX DAC
TRD [0:3]+
XTALI
XTALO
RDAC
8
8
PGA
ADC FFE
MII
MGMT
Control
MII
Registers
Modes
SGIN
±
SCLK±
SGOUT±
TX_CLK
GTX_CLK
TX_ER
TX_EN
TXD[7:0]
Auto-
Negotiation
Clock
Generator
Bias
Generator
SerDes/
SGSMII
Timing &
Phase
Recovery
DFE/
Trellis
Decoder
XTALK
Canceller
X3
Echo
Canceller
Gain
Automatic
Control
BCM5461S
RXD[7:0]
RX_ER
RX_DV
RX_CLK
CRS
COL
FDXLED
XMLED
RCVLED
Link[1]
Link[2]
MUX
LED
Drivers
Symbol
Encoder
Symbol
Decoder/
Aligner
