O V ERVI EW

®

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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

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.

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